China MP3 player HM-K02-001 with built-in rechargeable battery and as light as 22 grams. The front and back side printing can be customized for quantity over 3000 pieces. It's a great promotional gift for product and service promotion with company name, logo, brief introduction, telephone number and Web site address on it.

Power: Rechargeable 200 mAH Li-ion battery ( built-in)
S/N ratio: 85dB
Earphone O/P: 10mW
Frequency response: 20Hz ~ 20KHz
Built-in memory: 2GB ( other size optional)