Wireless personal voice amplifier

If being clearly heard is a constant struggle, Amp-Up™ Mini makes it easy to be heard without straining your voice. With its lightweight design, long battery life, wireless headphone mic and clear, crisp amplification, the Amp-Up™ Mini delivers the functionality you need in a compact design you'll want: This unit is a sure winner and a must-have for teachers, coaches, presenters, professors, people wearing masks, and so many others! Amplifier Specifications: Output Power: 10W max./5W RMS Speaker Driver: 5W Charging Voltage: USB/DC 5V 0.5A Lithium battery: 3.7V/1500mAh Manual-channel connecting Unit can be up to approx. 150 ft. from wireless microphone without obstacles Working Temperature: 14°F~140°F Frequency Response: 200Hz~20KHz Operating Time: Approx. 4~7 hours Battery Charging Time: Approx. 3~4 hours Microphone Specifications: Type: Unidirectional Sensitivity: -35dB +-2dB Polymer Battery: 3.7V 450mA Working Voltage: -3.5V ~ 4.2V Battery Charging Time: Approx. 2~3 hours Operating Time: Approx. 4~5 hours