Review on SHIDU Bluetooth Voice Amplifier: 18W Waterproof Speaker with Wired Microphone Headset - Portable Rechargeable PA System, Power Bank for Outdoors, Teachers, Shower, Beach by Jeremy May

This is the best voice amplifier I've ever used! It works really great! I work in a prison and often work as a guide for volunteers. It was such a big help! They could hear me very well outside and inside the prison dormitory. This is excellent! I even used it in my Sunday school class. Amazing quality! You can use it to amplify your voice or you can use the Bluetooth option to listen to whatever you want. It even plays from a USB stick or micro SD card. Just plug it in and let it play. He also has the option to record his voice through the provided microphone and play it back later. The option I really like is that it has a large capacity lithium battery! You can use it for a very long time! I recommend without hesitation!