Voice Amplifier for Teachers with Bluetooth, Portable Rechargeable Wireless V…
★The wireless microphone can be used for about 6 hours. ★If no input signal is detected within 20 seconds, speaker will enter sleep mode automatically to save power. ★UHF 20W Voice Amplifier:The voice amplifier adopts UHF transmission, with 20W peak power to output powerful, clear, crisp and no noise & distortion sound.