3-in-1 Bluetooth Audio Receiver : This product is a wireless Bluetooth music receiver that supports optical fiber, coaxial, and AUX interfaces. It is specially designed for car stereos/speakers/headphones/old amplifiers and speaker equipment with digital optical fiber/coaxial interfaces, making ordinary speakers instantly transform into It becomes a Bluetooth speaker that can wirelessly transmit music from your phone to audio equipment. Suitable for , game consoles, CD players MP3, etc. It perfectly solves the limitations of Bluetooth-free audio devices and expands the functions of audio devices. Product main parameters. Name: Three-in-one Bluetooth receiver Model: B41 Supported equipment: one to two Frequency response range: 10Hz-20kHz input Signal-to-noise ratio:more than the 110dB Distortion + noise:less than 0.02% Bluetooth version:5.3+ Output impedance: 75 ohms Effective distance: 10 meters Support:A2DP/AVRCP Interface: Optical fiber/coaxial/AUX Power supply :Type-C Operating functions: 1: Connect the USB cable to the 5V charger, the product will automatically turn on, and the blue light will flash quickly to enter the search state. Open your phone and enter Bluetooth search, find the device name "B41" and click to connect. The connection success light flashes slowly, and the product can be connected to car audio/home audio systems/wired headphones. 2: After the mobile phone is successfully connected, you can wirelessly. The product can play up and down/increase and decrease the volume/play/pause. The optical fiber-coaxial AUX interface can be switched at will, and the 3D button can switch between heavy and low. Material: plastic colour: Black Package Contents: 1 x 3-in-1 Bluetooth Audio Receiver Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.