HamiltonBuhl Voice Amplifier Speaker 25W with Wireless Microphone up to 40 Channels Includes Carry Strap & Waistband Hook - Black

Wireless Mic Specifications: Direction: Unidirectional Sensitivity: -61dB +-1dB (0dB=1V/Pa) Polymer Battery: 3.7V 550mA Working voltage: 3.7V Impedance: ≤ 2.2KΩ Frequency: 30-23,000 Hz PA-25W Wireless Head-Worn Mic: Approx. 4-5 hours Amplifier Specifications: Output Power: 25W (max.) Charging Voltage: DC 5V 2A Lithium battery: 7.4V/2000mAh Charging Time: 3-5 hours Bluetooth: Version 5.0 Auto-channel searching Working Temperature: 14°F~113°F Frequency Response: 90Hz~18KHz PA-25W Amplifier: Approx. 8-9 hours (playing music) Approx. 10-11 hours (voice amplification only)