Multiple Uses Not Only for Car: The detachable connector design can solve the problems of headphones, old-fashioned speakers, etc, which are without Bluetooth-compatible function to realize the Bluetooth-compatible reception One-Click Hands-Free: Connect the Bluetooth-compatible receiver to the car AUX interface, then pair the mobile phone with BT receiver to realize hands-free and A2DP Use for Car Vehicle Navigation/Hands-Free Talking/Music Entertainment: Say goodbye to the danger of answering the phone while driving with one hand one-click hands-free function, for safe call answering Use for Wired Headphones 10g is As Light As Nothing: Wired headphones can also be transformed into Bluetooth-compatible headsets, which are more concise without wires Built-In Bluetooth-compatible V5.3 Powerful Chip Escort the Sound Quality: Adopt a professional audio chip, with Bluetooth-compatible 5.3 protocol, which makes audio analysis ability stronger, lower delay speed, and more stable signal transmission Specifications: Model: W1 Material: ABS Battery capacity: 120mAh Size: 4.6 x 3.2 x 1.5cm Product weight: about 10g Playback time: about 6 hours