Portable Bluetooth Voice Amplifier, Voice Amplifier for Teachers Lightweight Personal Microphone with Speaker Wired Headset, Apply to Classroom, Elderly, Coaches, Training, Presentation, Tour Guide

KozyOne - Professional anti-howling voice amplifier 1. The double voice coil and high power loudspeaker, low weight, bring clear sound, strong penetrating, and wide coverage.10W sound output is loud enough to be used for a group of 25-100 people. 2.Rechargeable voice amplifier: Very long operating time --- 8-10 hrs (microphone mode) / 6-8 hrs (music mode) & loud amplification with a single fully charged. 3. powerful waistband voice amplifier delivers amazing sound & excellent clarity; amplifies your voice across larger Auditoriums. 4. One key recording, easy to record your voice and broadcast repeatly. The function only works when you insert a TF card.