Feature:1. 2-in-1 BT 5.3 Receiver and Transmitter: This device can function as both a receiver and a transmitter, making it versatile and suitable for various audio devices.2. High Definition Noise Reduction: The built-in HD noise reduction feature ensures clear and high-quality sound during calls.3. Supports AAC/SBC Audio Decoding: This feature allows for high-quality audio streaming, enhancing your listening experience.4. Portable and Convenient: The new elastic pressure-style back clip design makes it lightweight and easy to carry. Simply plug in your 3.5mm wired headphones to upgrade them to BT headphones.5. Universal 3.5mm AUX Interface: This feature makes the device compatible with a wide range of audio equipment, allowing for seamless signal reception and transmission.Specification:Features:2-in-1 BT 5.3 Receiver and Transmitter: This device can function as both a receiver and a transmitter, making it versatile and suitable for various audio devices.High Definition Noise Reduction: The built-in HD noise reduction feature ensures clear and high-quality sound during calls.Supports AAC/SBC Audio Decoding: This feature allows for high-quality audio streaming, enhancing your listening experience.Portable and Convenient: The new elastic pressure-style back clip design makes it lightweight and easy to carry. Simply plug in your 3.5mm wired headphones to upgrade them to BT headphones.Universal 3.5mm AUX Interface: This feature makes the device compatible with a wide range of audio equipment, allowing for seamless signal reception and transmission.Specifications:Color: BlackBT Program: 5.3Frequency: 2.4GHz-2.48GHzBT transmission distance ≤ 15 metersBT receiving distance ≤15 metersBT receiving function: connect to 1 cell phoneBT transmit function: connect 1 pair of Bluetooth headsetBattery capacity: 180mahCharging time: 30 minutesPlayback time: up to 10 hoursPackage size: 10*7*2cmPackage weight: 40gPackage List:1 * Receiver AdapterPackage List:1 * Receiver Adapter