Amjimshop USB Bluetooth 3.5mm Audio Stereo Music Receiver for Iphone Car Mp3 White note: this device would not work with phone calls Output: 3.5 mm Audio interface Sound output rate: 44.1KHZ and 48KHZ Unit size: 41 x 20 x 10 mm Portable design: with mini size ,the feature of portable can let you carry them to anywhere you want. Transmission rate3Mbps Transmission distance: about 10 m Bluetooth 2.0+EDR Support A2DP V1.2 Powered by 5V DC