USING METHOD USB power supply connector access USB power supply interface 3.5mm audio interface to access the computer audio output socket Or MP3, MP4 or mobile phone audio output socket. Input/Output:USB Channels:2 (2.0) Output Voltage:12W Notes For The Desktop Computer: 1.Do not set the computer mute,checkifthe computerinstalled audiodriver,fnot,pleasedownload andinstallagain. 2. Insert the audio head or USB head into the socket behind the mainframe,not the frontsocket(because when install thesystem,the socket behind the mainframe is acquiescent to output voice.The front socketisnotbeenset,soithasnovoicewhen usethefrontsocket.) When mobile phone Bluetooth is used: a USB head is inserted into the computer host USB interfaceorthemobilephonechargerforpower supply, and then the mobile phone searches for Bluetooth.The name of Bluetooth is "Bluetooth Speaker". Computer use: a USB head into the computer behind the host USB interface, a 3.5 round audio head connected to the green headphonejack. (Be sure to plug in the interface at the back of the host, as the audio driver is oftennotset up properly at the front of the host.) Note: When using the computer and Bluetooth at the same time, you should first disconnect the phone's Bluetooth before using the computer! Color: Black Material: Plastic+Metal Package Contents: 1 x USB speakers Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.