Shidu Original Voice Amplifier M800

Rechargeable voice amplifier with built-in 4400mAh lithium battery, amplification time up to 12 hours. Music playback time up to 12 hours. Only takes 3-5 hours to fully charge. Can be used as a rechargeable battery to charge your device outdoors. Waterproof design. Supports TF (Micro SD) card playback, USB flash drive playback and 3.5mm AUX audio input (microphone port can be used as AUX port) Recording, loop playback, Bluetooth 5.0 (can be connected to cell phone Bluetooth 5.0)