--- product_id: 34791532 title: "VPOW312-USB Universal AC/DC Power Adapter 3V-12V with USB Port and 8 Tips" brand: "protechtrader" price: "$29.06" currency: USD in_stock: true reviews_count: 13 category: "Pro Tech Trader" url: https://www.desertcart.us/products/34791532-vpow312-usb-universal-ac-dc-power-adapter-3v-12v-usb store_origin: US region: United States of America --- # Built-in USB port for versatile charging 8 reversible polarity tips 7 voltage settings (3V-12V) VPOW312-USB Universal AC/DC Power Adapter 3V-12V with USB Port and 8 Tips **Brand:** protechtrader **Price:** $29.06 **Availability:** ✅ In Stock ## Summary > ⚡ Power up your life with one adapter to rule them all! ## Quick Answers - **What is this?** VPOW312-USB Universal AC/DC Power Adapter 3V-12V with USB Port and 8 Tips by protechtrader - **How much does it cost?** $29.06 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/34791532-vpow312-usb-universal-ac-dc-power-adapter-3v-12v-usb) ## Best For - protechtrader enthusiasts ## Why This Product - Trusted protechtrader brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Polarity Perfect:** Flip any of the 8 interchangeable DC tips to match center-positive or center-negative polarity—no guesswork, just plug and play. - • **Compact Powerhouse:** Small footprint (2x1x2 inches) and lightweight design make it the perfect travel companion for professionals on the move. - • **Trusted Reliability:** Backed by a 90-day replacement warranty and glowing 4.6-star reviews, this adapter is your go-to for hassle-free power solutions. - • **USB-Ready Convenience:** Charge or power USB-compatible gadgets directly with the integrated USB port—cutting down on clutter and extra chargers. - • **Universal Voltage Flexibility:** Seamlessly switch between 3V, 4.5V, 5V, 6V, 7.5V, 9V, and 12V outputs to power all your essential devices. ## Overview The VPOW312-USB Universal AC/DC Power Adapter offers 7 adjustable voltage settings from 3V to 12V, 8 reversible polarity tips, and a built-in USB port, making it the ultimate all-in-one power solution for small electronics. Compact and lightweight, it supports a wide range of devices with easy polarity switching and comes with a 90-day replacement warranty, ensuring reliable and versatile performance for tech-savvy professionals. ## Description desertcart.com: VPOW312-USB Universal AC/DC Power Adapter 3V-12V with USB Port and 8 Tips : Electronics Review: Multiple settings, easy to use. - Exactly what was needed. Able to set the plug to the correct voltage and polarity required. More than satisfied. Review: Very useful product - My grandmother had a small radio she used to listen to all the time and continually asked me to get batteries for her. I tried rechargeable batteries but she was never satisfied, she didn't like them, they never lasted long enough. When mother passed we could not bring ourselves to get rid of that radio although it was probably not worth much. Funny how you remember things about loved ones when they are gone. She would also say one of these days I am gong to get me a plug in for that radio but she never did. I was fine with the rechargeable but I wondered if I could find the correct power supply for the radio. I searched several times to no avail. then I looked at the back of the radio and the input configuration. Still nothing I wondered if there was some kind of universal transformer but nothing seemed be the correct power and the correct input until I ran across this little gem. It has to be expensive I thought but i was determined to get something that worked. This device has 6 different connections so the guess work of getting the correct input was done for me (I would check however to make sure the polarity is correct). On the transformer which plugs into regular house current 120 AC there is a small switch on the side going from 3v 4.5v 5v 6v 9v 12v Switching Power Supply 1 amp AC to DC Universal Adapter 12w Transformer with 8 Tips 2.35 x 0.7mm, 2.5mm, 3.0 x 1.15mm, 3.5 x 1.35! I was ecstatic when i got the transformer just like a tech kid on Christmas morning. If this thing would work on the radio and it did I would be totally satisfied. However a couple days ago my Wife Margaret wanted to mail the children some Christmas gifts. We needed a scale. I told her we had one but probably needed a new battery. I remember the reason we had not used it in over 10 years it had a square battery and we just never got around to getting one. Then I had an idea I looked at the back and there was an input for external power supply. These things never seem to come with their own stuff I guess thats marketing or something but boy what a hassle. I looked for the correct input pulled out the one for the radio and plugged in the correct one for the scale and it worked perfectly I may have to get another one for my radio! I just wanted to send my appreciation for making such a useful product. Oh and the cost? I was pleasantly surprised very affordable. ## Features - Match compatible electronics by selecting 3V/4.5V/5V/6V/7.5V/9V/12V as the DC output. - Connect compatible devices with 8 interchangeable DC tips, or use the built-in USB port. - Reverse the installed DC tip to configure center-positive or center-negative polarity. - Check the device input voltage, connector fit, and required polarity before applying power. - Replace a matching power source for small electronics with one adaptable unit. This product is not a toy and is designed for use by teens and adults ages 13 and up ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01LBX8D58 | | Brand | ProTechTrader | | Built-In Media | AC/DC Power Adapter, 8 Reversible Polarity Tips, Key, Manual | | Color | Black | | Customer Reviews | 4.6 out of 5 stars 352 Reviews | | Input Voltage | 220 volts | | Item Dimensions | 2 x 1 x 2 inches | | Item Weight | 0.08 kg | | Item dimensions L x W x H | 2 x 1 x 2 inches | | Manufacturer | ProTechTrader | | Mfr Part Number | VPOW312-USB | | Model Number | VPOW312-USB | | Number of Items | 1 | | Number of Outlets | 2 | | Output Voltage | 12 volts | | Plug Type | Type A or Type B | | Power Source | Corded-Electric | | UPC | 789048342838 | | Unit Count | 1 Count | | Warranty Description | 90 Day Replacement Warranty - Contact ProTechTrader before Returning | ## Product Details - **Brand:** ProTechTrader - **Color:** Black - **Input Voltage:** 220 volts - **Item Weight:** 0.08 kg - **Item dimensions L x W x H:** 2 x 1 x 2 inches ## Images ![VPOW312-USB Universal AC/DC Power Adapter 3V-12V with USB Port and 8 Tips - Image 1](https://m.media-amazon.com/images/I/71jUSmRdUgL.jpg) ![VPOW312-USB Universal AC/DC Power Adapter 3V-12V with USB Port and 8 Tips - Image 2](https://m.media-amazon.com/images/I/81dA7d9vnXL.jpg) ![VPOW312-USB Universal AC/DC Power Adapter 3V-12V with USB Port and 8 Tips - Image 3](https://m.media-amazon.com/images/I/81uNq5aZBlL.jpg) ![VPOW312-USB Universal AC/DC Power Adapter 3V-12V with USB Port and 8 Tips - Image 4](https://m.media-amazon.com/images/I/71USxd6T72L.jpg) ![VPOW312-USB Universal AC/DC Power Adapter 3V-12V with USB Port and 8 Tips - Image 5](https://m.media-amazon.com/images/I/81Ae3MXHeuL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: How do you know that you are authentic?** A: A: If you see yourself in the mirror and you know that you're that person, and if you've been honest in your interactions with others, then that's a good definition of authentic. **Q: I need a unit that will supply power at 6V and 1.5-2W - will this device do that or will it over-power the wattage requirement?** A: It will work perfect at 6v 1w, 1.5w, 2w, 3w, 4w, 5w, 6w. You can not over watt or over current a device, as a device only draws as much current as it needs from the power supply. Watts are a measure of current output at a given voltage. As far as current is concerned, the more the better at the supply end as a device requiring only 1.5w will only draw 1.5w of current. Having more available does not hurt ether device at all. This does not apply to voltage, as it is important to match voltage from the source to your device (ie you have a 6v device so set this power supply to 6v), but the current is not something you have to set. You want to have at least the amount of current available that your device requires or more. More is better as the device will only draw or pull as much current as it needs. For example you device requires 6 volts and 2 watts, and lets say this power supply can produce 6 volts with up to 6 watts (this is equal to 1 amp or 1000ma). Even though the device had up to 6 watts available current, your devices maximum current draw is 2 watts at 6 volts so it will only get 2 watts and the power supply's additional current is not used, but available if a larger current draw is ever required by the device or a new device. Hope that made sense. If not you can kind of think of it like horsepower in a car. If you have 100 hp available in your car the engine (engine is like the power supply) is not always supplying the full 100 horsepower as the car load (the car load is like the devices current draw... aka load) may not require all 100 hp due to driving slowly with no passengers, but the power is still there if it is ever needed in the future. **Q: Will this fit and work with the brother pt-d200 label maker?** A: It should work. You can reverse the polarity with the tips. I am not site if the tips will fit **Q: what is the length of the cord?** A: The cord is 44 inches long or just over 3-1/2 feet long. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Multiple settings, easy to use. *by B***. on July 29, 2026* Exactly what was needed. Able to set the plug to the correct voltage and polarity required. More than satisfied. ### ⭐⭐⭐⭐⭐ Very useful product *by M***S on December 10, 2016* My grandmother had a small radio she used to listen to all the time and continually asked me to get batteries for her. I tried rechargeable batteries but she was never satisfied, she didn't like them, they never lasted long enough. When mother passed we could not bring ourselves to get rid of that radio although it was probably not worth much. Funny how you remember things about loved ones when they are gone. She would also say one of these days I am gong to get me a plug in for that radio but she never did. I was fine with the rechargeable but I wondered if I could find the correct power supply for the radio. I searched several times to no avail. then I looked at the back of the radio and the input configuration. Still nothing I wondered if there was some kind of universal transformer but nothing seemed be the correct power and the correct input until I ran across this little gem. It has to be expensive I thought but i was determined to get something that worked. This device has 6 different connections so the guess work of getting the correct input was done for me (I would check however to make sure the polarity is correct). On the transformer which plugs into regular house current 120 AC there is a small switch on the side going from 3v 4.5v 5v 6v 9v 12v Switching Power Supply 1 amp AC to DC Universal Adapter 12w Transformer with 8 Tips 2.35 x 0.7mm, 2.5mm, 3.0 x 1.15mm, 3.5 x 1.35! I was ecstatic when i got the transformer just like a tech kid on Christmas morning. If this thing would work on the radio and it did I would be totally satisfied. However a couple days ago my Wife Margaret wanted to mail the children some Christmas gifts. We needed a scale. I told her we had one but probably needed a new battery. I remember the reason we had not used it in over 10 years it had a square battery and we just never got around to getting one. Then I had an idea I looked at the back and there was an input for external power supply. These things never seem to come with their own stuff I guess thats marketing or something but boy what a hassle. I looked for the correct input pulled out the one for the radio and plugged in the correct one for the scale and it worked perfectly I may have to get another one for my radio! I just wanted to send my appreciation for making such a useful product. Oh and the cost? I was pleasantly surprised very affordable. ### ⭐⭐⭐⭐⭐ Solution for hard-to-find jack polarity, negative inner conductor *by F***E on December 3, 2025* Works good. Solution for hard-to-find jack polarity, negative inner conductor. No measured power draw at no-load, measured with 0.1 VA and 0.1 watt resolution. Yay. ## Frequently Bought Together - 3vdc -12 volt Universal AC/DC Power Adapter USB Port | 8 Reversible Polarity Positive or Negative Tips Center Tip 3v 4.5v 5v 6v 7.5v 9v 12v 1a 12w Transformer 5.5mm 2.5mm 2.1mm 3.5mm 4.0mm 5.0mm 1.7mm - SoulBay [Reverse Polarity] 30W Universal AC DC Adapter Switching Power Supply Selectable Voltage with 9 Tips for 3V 4.5V 5V 6V 7.5V 9V 12V Household Electronics, 2000mA 2Amps Output Max --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/34791532-vpow312-usb-universal-ac-dc-power-adapter-3v-12v-usb](https://www.desertcart.us/products/34791532-vpow312-usb-universal-ac-dc-power-adapter-3v-12v-usb) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-20*