Features: Easy To Operate: Simply connect your speaker with our device, immediately transform your speakers into a fashionable wireless Bluetooth speaker. Wireless Play: Removing troubles of wired connection, through the wireless connection and transmission ,enjoy a high fidelity music at any place indoor by wireless control. Perfectly Compatible: Our products can be compatible with nearly 95% of mobile phone or computer on the market. Support for iPhone and most kinds of smart phones. Portable design: with mini size ,the feature of 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 How to operate it Step one: For No USB port Speakers: Supply power to the device by connecting charger with 5 V USB interface, then connect the Speaker/'s AUX port with the audio cable. For Speakers with USB port: Connect the device with speaker's USB port directly ,then then connect the Speaker's AUX port with the audio cable. Step two: Turn on the Bluetooth function of computer, mobile or other device which has Bluetooth function, searching for the device to connect . After matching success ,the indicator light turn to twinkle slowly. Then you can use for iPhone and other bluetooth transmitter playing the music. Package includes: 1 x USB Bluetooth Audio Music Receiver 1 x 3.5mm Audio Cable