Ningbo Hentek Group Co.,Ltd.

Support audio formats: MP3, WAV, WMA
Built-in memory: 128MB to 4GB
Supported PC interface: USB 2.0 protocol (FS)
Power duration: 4 to 5 hours
Recharging time: 3 hours
Voice output power: 55mW
Earphone output power: 5mW
Normally working voltage: 30 to 35mV
Voice output frequency: 20Hz to 20kHz
Earphone impedance: 16 x 2
Signal-to-noise ratio: 87.2dB