Sanwa Supply Megaphone Speaker Hands-Free MM-SPAMP2

[Maximum practical output]: 10W [Frequency Response]: 80Hz~12KHz [Input signal]: Head microphone (-44dB ~ -47dB) [Power Source]: Built-in lithium-ion battery (3.7V 2000mA) [Charging Method]: AC adapter DC5V/600mA [Charging time]: Approximately 5 hours [Continuous usage time]: Approximately 20 hours with microphone use (medium volume), approximately 16 hours for music playback (medium volume) [Microphone Input]: 3.5mm microphone jack [External Input]: 3.5mm stereo mini jack (LINE IN), USB memory, microSD card (16GB or less) [Material]: ABS Accessories: Megaphone speaker x 1, head microphone x 1, strap x 1, clip x 1, AC adapter (DC5V 600mA) x 1, instruction manual