E94 Sample Specifications   

Driver Diameter    40MM

Bluetooth version    5.3

Frequency Response    20Hz-20000Hz

Battery Voltage    5V±0.5V

Playing Time    18H

Charging Time    2H

Distance    10M

Largest Power    20mW

Sensitivity    100±3db

Battery Capacity    300mAh

Impedance    32 Ohm

The same model supports the production of noise reduction versions