【Advanced Bluetooth 5.4】Featuring the latest Bluetooth 5.4 technology for improved connectivity, stability, and range 【Easy to Use】The two-in-one design enables your audio device to stream music to headphones or speakers, so you can send and receive all audio freely and easily 【Clear Sound】Enjoy a wider working range of up to 30 feet, this auxiliary receiver provides stable performance and supports voice prompts for high-quality audio. Answer calls or play music in the car without any interference 【Multi-Functional Design】Supports Bluetooth playback, receiving, transmitting, and call functionality, making it ideal for various audio applications 【Extended Battery Life】With a 150mAh capacity, it offers approximately 10 hours in receiver mode and 7 hours in transmitter mode 【Wide Compatibility】Press the button in the center of the front and the device will start pairing with the next device, suitable for all smartphones, audio devices and stereo devices with audio input ports Specifications: Model: M18 Bluetooth Version: 5.4 Transmission Range: 10m (unobstructed) Material: ABS Battery Capacity: 150mAh Working Time: Approx. 10h (receiving mode), 7h (transmitting mode) Charging Port: Type-C Audio Interface: 3.5mm AUX