New, never used. FROM RETAILER Name: AUX Bluetooth Audio Receiver Bluetooth Version: Bluetooth 4.1 Material: PC, Metal Interface Type: 3.5mm Charge Time: About 30 min Working Time: About 3h (Also works when charging) Receiver Size: 1.4*1.5*5.8cm / 0.5*0.6*2.3" (L*W*H) Functions: Volume and Play Control; Turn Non-Bluetooth devices to Bluetooth-Enabled for Connecting headphones, connecting mobile phones, connecting speakers, connecting cars Package Includes 1 x Bluetooth Music Receiver 1 x Micro USB Power Cable 1 x 3.5mm Audio Connector 1 x User Manual Features HANDS-FREE WIRELESS MUSIC RECEIVER - Make your Car AUX audio and Home Theater AV surround systems become bluetooth compatible; get music from Bluetooth enabled device such as Smartphone or Bluetooth PC, Laptop TURN NON-BLUETOOTH TO BLUETOOTH-ENABLED HEADPHONES - Turn your non-Bluetooth headphones to Bluetooth-enabled, just connect the Bluetooth adapter with your non-Bluetooth headphones through the 3.5mm audio cable; then to enjoy your favorite music from your phone with your headphones. CONTROL THE LISTENING EXPERIENCE - Change tracks, turn up/ down the volume, or play/pause music all from the receiver. PORTABLE DESIGN - Mini size with clip design the feature of portable can let you carry them to anywhere you want. HIGH-PERFORMANCE AMP CHIP - Can push the headset, and high-power speaker, applicable to all types of speakers BUILT-IN RECHARGEABLE LI-ION BATTERY - Charging by Micro USB port, long work time and low consumption. Note: If you cannot hear the music: a. Make sure your stereo system is set to "AUX" input or whichever input is the corresponding input to the music receiver. b. Check and make sure the volume is not turned down or muted.