With micro SD card slot and USB slot to play and recording function
RMS: 10W maximum
Frequency response: 100Hz to 15kHz
Speaker: 3-inch 4Ω speaker
power supply : 7.4V/2,200mAh (built-in lithium battery)
Operating temperature: 0 to 45°C; discharge: 20-55°C; storage:-5-35°°C
Dimensions: 127 x 103 x 48.5mm
Weight: 320g
30pcs in one carton