Item Name: Stereo Wireless Bluetooth 4.1 AUX Audio Receiver Car Kit Bluetooth headset. Use with home stereos/speakers, car stereos, headphones etc .Color: Black.Dimension: 55mm (L) x 25mm (W) x 10mm (D) / 2.17" x 0.98" x 0.40" (Approx.).Support Bluetooth hands-free function.Wireless music receiver connects to 3.5mm headphone jacks.Frequency: 2.4GHz.Bluetooth: v3.0+EDR, Class 2.Transmission Distance: up to 10m.Operation time: up to 8 hours.Bluetooth stereo audio profile: A2DP.Weight: 1.23oz (35g).3.5mm stereo audio output.Bluetooth receiver + normal headset, It instantly turn into Bluetooth headset !!Make your Car AUX audio sytem and Home Theater AV HiFi Surrounding system become bluetooth compatible, get music from Bluetooth enable device such as iPhone, iPad, iPod, HTC Samsung Smart cellphone or Bluetooth PC, Laptop.Simply connect this bluetooth audio receiver to your line-in or auxiliary input on your speakers, pair it to yourBluetooth enabled device, and enjoy the wireless music revolution.Whether you want Bluetooth convenience in your car, through your home-theater system, in your kitchen, bathroom, or bedroom, etc.Simple operation, 3.5mm Male to Male Audio Connector or 3.5mm Male to Male Audio Cable to connect the speakers and the receiver.High-performance AMP chip, can push the headset, and high-power speaker, applicable to all types of speakers.Powerful bluetooth IC, More stronger compatibility.