Model Number: A636 Brand Name: OEM Key Specifications/Special Features: Features:* Retractable USB design, user friendly* Material: plastic + rubber coating* Display: dot matrix STN, resolution: 128*64* Music format: MP3, WMA and WAV* SN: ≥85dB* Earphone: max output (L) 5mW + (R) 5mW (32ohm)* Distortion: 0.03%* Recording format: WAV, rate: (32K bps/44Kbps/64Kbps/88Kbps)
* Memory: built-in 4GB-32GB, micro SD card expandable up to 64GB
* FM frequency: 87.5MHz-108MHz (optional)
* Battery type: rechargeable Li-battery, play musicaround 8-10 hours