Specifications: Product name: Bluetooth-compatible receiver. Product color: black , white(optional). Material: ABS. Bluetooth-compatible vesion: 3.0. Charging port: USB. Receiving distance: 10 meters. Transmission rate: 5 (Mbps). Working frequency: 2.4 (MHz). Features: Wireless Listening: Transmit Your Perfect Audio entertainment wirelessly from your smartphone or tablet, and listen to music with perfect sound quality via this wireless Bluetooth-compatible Receiver.Easy Pairing: one-click power-back, pair your smartphone or tablet with an audio adapter (receive mode only). Easy to connect: For most speakers, simply connect the adapter to a hi-fi speaker, speaker or headset through a standard RCA/AV or 3.5 mm socket, and connect two speakers to for play music. Excellent Sound Effects: Bluetooth-compatible 3.0 chip module, wireless transmission of high-quality sound with no delay from your traditional speakers, remote control of music playback, no-compromise on sound, latest Acoustic Isolation Technology for BT adapters, and advanced laboratory tuning, provides first-class audio quality. Package Includes:1PC x Bluetooth-compatible Adapter. note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.