Matiral: ABS
Working voltage：3.7V

Bluetooth version: 4.2
① Speaker parameter
Speaker specification：Ф52mm 4Ω 5W
Signal-to-noise ratio: >90dB
Response frequency: 60-20KHz
Distortion：≤1%
Bluetooth receiving distance: ≥10M
② Wireless charging parameter
Input: DC 5V 2.4A max
Output:DC5V1.5Amax
Output power:7.5W max
Charge frequency:110-205KHz
Charge distance:4~8mm
Charge Efficiency:≥75%
Compatibility: all Built-in QI Wireless receiver(such as IPhone8/IPhone8P/IPhoneX,Samsung S7/S8 etc..)