* Sensitivity: 108±3dB at 1kHz S.P.L * Frequency: 20Hz -20kHz * Channel separate limit:30dB at 1kHz S.P.L * Impedance: 32ohm±10% * Driver Unit: 40mm * Output power: 10mW * FM Frequency Response: 87.5MHz-108MHz * S/N rate: About 70dB (1kHz) * Sampling rate:(Bit rate) 32/44.1/48kHz (8Kbps-320Kbps) * Support file format: Mp3 * 3.7V rechargeable Lithium battery power supply(3.7V 500mAh) * Static state electric current less than 40uA * Operation electric current when headphone output less than 80mA * USB port of computer to charging,the maximal charge electric current 200mA

* SD Card Headphone * FM Radio * Wired headphone * Rechargeable Lithium Battery