The iGadgitz Bluetooth Stereo Audio Receiver works by "receiving" audio from Bluetooth enabled devices or those working with a Bluetooth transmitter. Simply plug the receiver into a 3.5mm auxiliary input, pair with the Bluetooth device and then sit back and enjoy being able to control your music from your phone or tablet. Compatible with Bluetooth devices with A2DP profile (Advanced Audio Distribution Profile) and and AVRCP )Audio/Video Remote Control Profile). Specification Bluetooth V2.1+EDR Bluetooth profiles supported: A2DP, AVRCP Range: 10m (33 ft) Rechargeable 300mAh Li-polymer battery (built-in) Frequency response: 2.4GHz-2.4835GHz Receiving sensitivity: -74±4dB Charging input voltage: DC 5V Charging time: Approx. 2.5 hours Working time: Up to 12 hours Standby time: Up to 230 hours Dimensions: 45×32×8mm Weight: 14g