and high quality. High quaility ISSC chips for stable transmission and with noise reduction function. Music playing in a stereo sound,provide you with professional experience. Direct connection to AUX/ via audio cable connection. for changing your acoustics devices to bluetooth one. 3.5mm audio interface,just plug in and then you can use it Handsfree calling for a convenient and safe driving for you and your family Memory matching function help you fastly call the number you last dialed LED light instruction for consice and convenience With bluetooth button for your control the connection and calling Connecting to one phone or device for one time Suitable for home and car and travel etc. Bluetooth receiver only,any other accessories not included Specifications: SNR: Greater than 95dB Bluetooth standard: 5.0 EDR Support protocols: A2DP, AVRCP, HSP, HFP Bluetooth frequency range: 2.4GHz-2.48GHz Effective distance:10m(vary for different phone and enviroment) Battery capacity:100mA/3.7V Working time:about 7 hours Charging time:about 2 hours Calling time: about 6 hours Music playing time: about 6.5 hours Instruction light:red when charing,green when working Working temperature: -10℃ -+50 ℃ Color: Black Material: ABS Package Contents: 1 x Receiver 1 x Charging cable