... headset/movement MP3 player/ running wearing/headphones for wireless headset /TF card/timbre1,system:Windows98/2000/XP2,USB:USB 2.0 ... memory, is card type, the biggest support 8 GB, adaptation TF card/micro sd card4, charging power supply: computer USB port ... than 3 hours7, frequency response: 20 Hz-20 KHz8, signal-to-noise ratio: > 85 db9, working environment temperature: centigrade 0 ° C ...