J33 Car Audio Amplifier Headphone Bluetooth Audio Converter Adapter 1. Built in clear call microphone, supports Bluetooth call function, suitable for wired headphones, car audio, answering, hanging up and rejecting calls, built-in microphone, short press the function key once, long press the function key for 2 seconds, eliminates noise, clear call 2. Upgrade the old audio system to Bluetooth and upgrade the wired earphones to Bluetooth earphones. The wired earphones will become wireless, and the 3.5mm plug earphones will be matched with Bluetooth function for barrier free transmission, making listening to music more convenient, lossless decoding, and dual ear immersion 3. Connect two devices simultaneously, allowing you to connect two phonestabletsBluetooth earphones, switch back and forth, and use freely AUX interface, widely compatible, plug and play, can be used on audio devices with AUX input interface, including car, speakers, and headphones Bluetooth 5.0 Long battery life of over 10 hours, built-in 200mAh rechargeable lithium battery with low-power 5.0 chip, can last for over 10 hours 4. Adapt to the product: Compatible with For Apple, For Samsung, For Xiaomi, For Huawei, HTC, For Nokia and other mobile phones, tablets, computers, headphones, speakers, car audio and other devices. Product parameters 1. Output interface: 3.5mm stereo connector 2. Frequency response: 50~200Hz 3. Bluetooth version: Bluetooth 5.0 4. Transmission distance: 10~15m 5. Battery capacity: 200mAh 6. Charging port: PD Type-C