Features: 1. Easy To Operate: Simply connect your speaker with our device, and immediately transform your speakers into a fashionable wireless Bluetooth speaker. 2. Wireless Play: Removing troubles of a wired connection, through the wireless connection and transmission, enjoy high fidelity music at any place indoors by wireless control. 3. Perfectly Compatible: Our products can be compatible with nearly 95% of the mobile phones or computers on the market. Support for iPhone and most kinds of smartphones. 4. Portable design: with mini size, the feature of the portable can let you carry them to anywhere you want. Specifications: Bluetooth 2.1+EDR Support A2DP V1.2 Powered by 5V DC Transmission rate: 3(Mbps) Transmission distance: About 10 m Power supply mode: USB-POWER Unit size: 55*20*10mm Color: Black/White Package Includes: 1*USB Bluetooth Audio Music Receiver 1*3.5mm Audio Cable Operation steps: Step one: For No USB port Speakers: Supply power to the device by connecting the charger with a 5 V USB interface, then connect the Speaker's AUX port with the audio cable. For Speakers with USB ports: Connect the device with the speaker's USB port directly, than then connect the Speaker's AUX port with the audio cable. Step two: Turn on the Bluetooth function of a computer, mobile, or another device that has Bluetooth function, searching for the H-163 device to connect and input: 0000 for matching when the device is in the matching mode. After matching success, the indicator light turns to twinkle slowly. Then you can use it for iPhone and other Bluetooth transmitters playing the music.