Solution: BK4.2 TWS
Power output: 3W*2
Function:AUX/ BT/handsfree
speaker:40mm 4Ω 3W*2
Battery Capacity:1200mAH
Voltage:DC 5V
Bluetooth distance:10M
S/N ratio:≥75dB
Frequency response:180--18K Hz
Distortion:≤0.1% w1K Hz
Working time:3-4hours at 70% vol
Charinging time:1-2hours
Color:red, blue,yellow, green
Material:ABS+Iron+rubber coating
Accessories:Charging Cable,manual