Method The headphone can support WIN2000 and XP system. But WIN98 system must install CD. 2 Open control box and Put into 2 pcs AAA?battery. 3 Switched the light on, headphones will be vibrated lightly. If adjust the switch to 2 channel, vibration will be heavily. ?#65291;can control volume, the user can feel free to adjust volume. 5 MUTE.M?can control the microphone on or off. Details Headphone: Driver Unit 50MM Frequency Sound 20HZ-20,000HZ Impendance:32 Sensitivity:120dB?dB Max Output Power:120mW Surge: 8 Microphone Driver Unit 6*5 Impedance:2.2K Sensitivity:-54 dB?dB Frequency Sound Range:30HZ-16,000HZ Connector Port :USB plug Cord Length:2.5M K-590 Features: In order to compensate the shortage of traditional earphones, the vibration earphone adds vibration function so that the user feels more verisimilar. Also, If you are busy, the earphone will give a ear rub to eliminate tiredness and health care. Attention: (1) Please use the headphone correctly. (2) In order to avoid Harm hearing, please don t use big volume for long time. Also, the earphone must be dustproof, moistureproof to protect structure and function. (3) Please replace battery in time. (4) In order to avoid erode electronic part, please take out batteries if you don t use the earphone for a long time. : 3.0V