Shidu high regulation voice amplifier has 10 watt RMS output,
50 meter wireless distance, over 500 square meter sound cover,
usage time 10~15 hours, 2600 mAh rechargeable battery,
4 hours charging time, microphone sensitive -53dbv/pa, frequency response 120Hz~17kHz, input microphone -20db 600 ohm, speaker impedance 4 ohm, support MP3 files, microSD card up to 32 GB, USB pen drive and USB disk support, size 108 x 88 x 37 mm.