---
product_id: 421160912
title: "Bluetooth Voice Amplifier Speaker Waterproof, Microphone Amplifier Wireless Portable Megaphone Loudspeaker 18W Output for Outdoor, Teachers, Coaches, Elderly, Tour Guide, Presentation and More (Black)"
brand: "responsebridge"
price: "$411.10"
currency: USD
in_stock: true
reviews_count: 5
url: https://www.desertcart.us/products/421160912-bluetooth-voice-amplifier-speaker-waterproof-microphone-amplifier-wireless-portable-megaphone
store_origin: US
region: United States of America
---

# 35m wireless range 18W powerful output 12 hrs battery life Bluetooth Voice Amplifier Speaker Waterproof, Microphone Amplifier Wireless Portable Megaphone Loudspeaker 18W Output for Outdoor, Teachers, Coaches, Elderly, Tour Guide, Presentation and More (Black)

**Brand:** responsebridge
**Price:** $411.10
**Availability:** ✅ In Stock

## Summary

> 🎤 Amplify your presence, anywhere, anytime!

## Quick Answers

- **What is this?** Bluetooth Voice Amplifier Speaker Waterproof, Microphone Amplifier Wireless Portable Megaphone Loudspeaker 18W Output for Outdoor, Teachers, Coaches, Elderly, Tour Guide, Presentation and More (Black) by responsebridge
- **How much does it cost?** $411.10 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/421160912-bluetooth-voice-amplifier-speaker-waterproof-microphone-amplifier-wireless-portable-megaphone)

## Best For

- responsebridge enthusiasts

## Why This Product

- Trusted responsebridge brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Versatile Audio Inputs:** Supports AUX and TF card for ultimate flexibility in any setting or event.
- • **All-Day Amplification Power:** Robust 4400mAh battery delivers up to 12 hours of uninterrupted, crystal-clear sound.
- • **Confidence Backed by Warranty:** 12-month worry-free warranty and responsive customer support ensure your investment is protected.
- • **Unleash Your Voice, Wire-Free:** Comfortable UHF wireless headset mic with 35m range keeps you moving freely without the bulk.
- • **Seamless Bluetooth 4.2 Streaming:** Stream your favorite playlists or presentations effortlessly from any Bluetooth device within 33 feet.

## Overview

The ResponseBridge RB-800U is a sleek, portable 18W Bluetooth voice amplifier with a wireless UHF headset mic offering a 35m range. Featuring a long-lasting 4400mAh battery for up to 12 hours of continuous use, Bluetooth 4.2 streaming, and multiple audio inputs, it’s designed for professionals who demand clear, powerful sound on the go. Perfect for teachers, coaches, tour guides, and presenters seeking effortless mobility and reliable performance.

## Description

[Wireless, no burden] You will get a wireless uhf comfortable headsest microphone(35m/100ft), no need to carry the amplifier just put it on table around you.

## Features

- [Wireless, no burden] You will get a wireless uhf comfortable headsest microphone(35m/100ft), no need to carry the amplifier just put it on table around you.
- [Long batery life] This high power speaker comes with 4400mAh rechargeable lithium battery, gives you up to 12 hrs wireless stable continuous amplification with a single charge; Ideal for personal or
- [Bluetooth 4.2] Not only an amplifiers but also a bt speaker, you can stream your favorite music from any type of Bluetooth-enabled mobile device, up to 33 feet away; Also support Aux input, TF Card,
- [Worry-Free Warranty] At ResponseBridge, we believe in our products. That's why we back them all with an 12-month warranty and provide friendly, easy-to-reach support.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Mounting Type | Tabletop, Floor Standing |
| Power Source | Battery Powered |
| Connector Type | 3 5mm TRS |
| Item Weight | 13 Ounces |
| Number of Channels | 1 |
| Audio Input | AUX, TF Card |
| Manufacturer | ResponseBridge |
| Brand Name | ResponseBridge |
| Speaker Type | Outdoor |
| Colour Name | Black |
| Peak Power Handling - Speakers | 18 Watts |
| RMS Power Range - Amplifiers | 18 Watts |
| Product Dimensions | 11.94 x 9.65 x 4.57 cm; 368.54 g |
| Batteries | 1 A batteries required. (included) |
| Item model number | RB-800U |
| Country of Origin | USA |
| Item Weight | 368 g |

## Product Details

- **Brand:** ResponseBridge
- **Item dimensions L x W x H:** 11.9 x 9.7 x 4.6 Centimeters
- **Connectivity Technology:** AUX, Bluetooth
- **Colour:** Black
- **Compatible Devices:** Amplifier, Speaker

## Images

![Bluetooth Voice Amplifier Speaker Waterproof, Microphone Amplifier Wireless Portable Megaphone Loudspeaker 18W Output for Outdoor, Teachers, Coaches, Elderly, Tour Guide, Presentation and More (Black) - Image 1](https://m.media-amazon.com/images/I/71Q9AdfbL4L.jpg)
![Bluetooth Voice Amplifier Speaker Waterproof, Microphone Amplifier Wireless Portable Megaphone Loudspeaker 18W Output for Outdoor, Teachers, Coaches, Elderly, Tour Guide, Presentation and More (Black) - Image 2](https://m.media-amazon.com/images/I/71YNNulMFBL.jpg)
![Bluetooth Voice Amplifier Speaker Waterproof, Microphone Amplifier Wireless Portable Megaphone Loudspeaker 18W Output for Outdoor, Teachers, Coaches, Elderly, Tour Guide, Presentation and More (Black) - Image 3](https://m.media-amazon.com/images/I/61d4GDVN0sL.jpg)
![Bluetooth Voice Amplifier Speaker Waterproof, Microphone Amplifier Wireless Portable Megaphone Loudspeaker 18W Output for Outdoor, Teachers, Coaches, Elderly, Tour Guide, Presentation and More (Black) - Image 4](https://m.media-amazon.com/images/I/819JxO4E1hL.jpg)
![Bluetooth Voice Amplifier Speaker Waterproof, Microphone Amplifier Wireless Portable Megaphone Loudspeaker 18W Output for Outdoor, Teachers, Coaches, Elderly, Tour Guide, Presentation and More (Black) - Image 5](https://m.media-amazon.com/images/I/61Cr+z8qlzL.jpg)

## Questions & Answers

**Q: How to pair this wireless amplifier and microphone?**
A: Hi, normally we have already paired it for you before you receive the package, if you need to re-pair it, please follow the steps below and I will attach a video for your reference:

Step 1: Turn on the voice amplifier, short press""M" key to switch to UHF mode, long press“M" key for 3 seconds,amplifier comes a voice prompt "UHF is waiting for conn-ection".
Step 2:Turn on the wireless microphone and long press top key for 5 seconds, pairing is successful with a woiceprompt-UHF is connected".

please contact the Service Department (cindyresponse@outlook.com)if you have any problems with the products. 

We will give you a positive response within 24 hours.

**Q: can you connect to a separate speaker with music via bluetooth? I already use bluetooth for my music. Can I also connect two devices using bluetooth?**
A: Yes, you can connect to a separate speaker with music via bluetooth.

**Q: How do I get a second wireless mic headset for this to use when battery dies on first headset?**
A: The wireless set is unreliable and I was never able to find a replacement. So I went with wired and no more problems.

**Q: It says the battery can last up to 2-3 years. But I don’t see any opening on the devise to put new ones.  Can the batteries be replaced by the owner?**
A: It is a rechargable battery (in both the headset and the amplifier). If there is a limit on the life of the rechargable battery, I'm not aware of it and I've had no issues with my batteries after far more than 3 years.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    A very good voice amplifier for the money.  Great customer service.
  

*by B***F on Reviewed in the United States on 1 October 2022*

We purchased this for a fitness instructor who teaches exercise classes.  Overall the product works well, but when laying flat on your back doing exercises, the microphone / headset is pulled down by gravity and gets too close to the mouth.  Otherwise it's been very good.  In normal use we did not have this problem.  Perhaps in a future model, the company could provide a more firm headset extension that works in any position.Problem and Resolution: Six months after my purchase, the microphone started cutting in and out during exercise sessions.  I contacted the seller who provided incredible customer service.  We emailed back and forth a few times to isolate the problem.  After it was determined that there was a loose connection somewhere in the microphone headset, the company sent us out a new unit.  The new one is working great.  Thanks to Cindy for her pleasant email manner and overall great support.

### ⭐⭐⭐⭐⭐ 







  
  
    Great Product
  

*by B***X on Reviewed in Canada on 30 July 2022*

Useful and handy. Love it. Great use for hiking, just wear it around your body. Waterproof feature, great for outdoor use. Can be useful for karaoke and you can use a power bank for backup power. Great and useful tool.

### ⭐⭐⭐⭐⭐ 







  
  
    Quite a impresive product
  

*by O***E on Reviewed in the United Kingdom on 12 September 2023*

Not gonna lie, this product is quite impressive. Before purchasing the product I did not check its dimensions, but it looked powerful so I took it. It is actually quite small (maybe in lenght it's about the size of my hand). However, it produces a very powerful and clean sound. I love that the battery is rechargeble and that it can be used both with 3.5mm and Bluetooth. I'd say that it is quite straightforward to use, nothing that I haven't seen so far. The build is very robust and I do believe that it is waterproof (haven't tested it yet). When I fully charged the battery firstly it worked for about 12 hours? So yes, that is damn impressive and I strongly recommend this product.

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-01-31*