5V3A Power Supply by MakerSpot with Switch 2.5A 2A 1.5A 1A Fast Rapid Charge AC Adapter w/ 1.5m Extra Long On Off Power Switch Micro USB Cable for Raspberry Pi 3 Model B/B+ Plus (2 Pack)

Just tested two PSUs with a Pi 3B and also a Pi 3Bplus.Stress test ran without an undervoltage. However I'm not convinced they pump out exactly what they claim. I have a coupe of cheap USB power monitors and simply having those plugged in line lead to an undervoltage report for Pi 3B during boot.Other reviews mention power issues attaching screens. I have a single 3.3v devices connected via GPIO which worked for my quick tests. I would recommend these PSUs with a Pi without any other hardware (a fan might be OK, I've not tested that).Price is great considering the cable comes with a switch.

I use these exclusively for powering Raspberry Pis but use the right cable if you need max power. The supplied cable with switch is better than most but the voltage still falls out of spec with current draw over 2 amps (why the 4 stars). Use a top rated charging cable like an Anker to avoid power problems with a Pi 3 plus attached hard drive.

A switched power supply regulates voltage by switching on and off as opposed to a linear power supply that usesresistance to regulate voltage. Switched=more accurate V control and less heat. The USB cable (included) has On/Off.I ran Kali OS Pentests with a 2500ma supply and the "lightening" bolt indicating low power was always on. The processor is forced to run at a slower speed when this occurs. Running "headless" the RPi does not use as much power. But, if you want to have a monitor, keyboard and mouse attached the extra OOMPH (not a Technical word) provided by this power supply is just the ticket. An extra plus, it has USB connectivity which means you can charge your other 5V devices eg iPhone, more quickly. I am a customer and have NOT been compensated in any way to review this product.

Despite the great specifications, it is not capable of driving the Raspberry Pi 3B+. The lightning bolt indication keep coming up indicating undervoltage when the current demand goes up. Being rated 3A this adapter was suppose to comply with the minimum requirement of 2.5A on the Raspberry Pi, but it does not provide it.UPDATE: MAKE SURE TO USE THE PROVIDED USB CABLES... the issue I had described above wen away when I used the cables shipped with the product. I thought I had some good quality micro USB cables, but in the end the cable I used was the problem.

I plugged in Raspberry Pi, and it works great with no undervoltage warnings. I appreciate having the power switch as well. Probably better for the Pi's connector to not be unplugging it and plugging it back in again. I know that in the past, I've had Pi's become a little sensitive to how the power is plugged in, and I imagine that regular plugging and unplugging probably loosened the connector.

I've had no issues with mine and there doing exactly what there suppost to do, I consider them a good value myself.

I bought 2 for my 2 Raspberry Pi model 2b. Got ride of the low voltage lightning bolt and the PI’s are much more responsive with the proper voltage. The on/off switch is a plus.

I've bought many USB power supplies and this is the only one I've found so far that provides enough current. This produces enough power for the Raspberry Pi 3b+ and then some. No more yellow lightning bolt on the screen, or kernel messages about low power. I especially like that the power cord has an on/off switch.