Feature 100% brand new and high quality. Compact and mini-sized design,easy to take along with. Built in microphone, supports handsfree function. Enable you to enjoy music and voice in the Bluetooth-Compatible-enabled multimedia or music player wirelessly with a companion Bluetooth-Compatible Stereo headset. Specifications Size: about 6cm x 2cm x 0.8cm Bluetooth-Compatible Specification: V2.1 Supported profiles: A2DP, AVRCP The receiver distance: about 10m (without Block) Instructions for Use Insert the receiver into the speaker's USB interface. Open the Bluetooth-Compatible enabled mobile phone (or car /speaker), and search the surrounding bluetooth-Compatible devices to find a device called BT-DONGLE and then its' pairing code is 0000(if asked),after the pairing is successful, the led light will slow down. Then you can select the music via Bluetooth-Compatible from a cell phone or computer, a great music will play from speaker. Package Included 1x USB Bluetooth-Compatible Music Receiver