18W Waterproof Voice Amplifier with Wireless Microphone — 3.7V 2500 mAh Battery, TF Card/U-disk Playback for Teacher & Tour Guide, Long Working Hours

18W waterproof voice amplifier engineered for teachers and tour guides, offering long working hours. Advanced original noise-reduction processing delivers clearer speech with reduced background noise. Includes a wireless microphone and supports phone connection for faster, more stable audio transmission. Powered by a rechargeable 3.7V 2500 mAh large-capacity battery for extended use. Accepts an insertable TF card or U-disk with intelligent decoding for direct playback. Also supports audio input playback and can be used as an external speaker for computers and other devices.