For connecting the stereo system to a Bluetooth® headset or for transferring music, e.g. via smartphone to a hi-fi system. Can be used as transmitter and receiver. Transmitter for transmitting music from a TV or hi-fi system etc. to Bluetooth® headphones. Multipoint support for 2 devices. Up to 4 receivers can be stored. Receiver is used to transmit music e.g. from a smartphone via Bluetooth® to a HiFi system. When used as a receiver, up to 8 transmitters can be stored, whereby the audio signal can each be received by a BT device. Suitable for pairing with any Bluetooth® compatible device such as smartphones or headphones.  Aux-In via supplied 3,5 mm jack cable. Version 4.1, A2DP profile support. Support of the APTX code for higher audio quality e.g. with FLAC. Range up to 10 m. Integrated battery for mobile, independent use, charging via Micro-USB