Parameter:   Product Name: Multi function Bluetooth adapter   Product Model: T38   Bluetooth Version: Bluetooth V5.0   Battery: Do not bulit-in battery (Powered by usb charging)   Transmission Range: 10m (barrier free)   Interface: 3.5mm AUX/COAXIAL/OPTICAL/RCA   Support Protocol: A2DP/AVRCP/EDR/HSP   Using Method: Drive free   Basic Functions: Bluetooth receiver, Bluetooth transmitter, touch screen key operation, digital fiber / coaxial /3.5mm input, led display.   Support Devices: All kinds of car, speakers,desktop computer, laptop, TV, power amplifier,projector etc.   Colour: black   Material: plastic      Package Contents:   1 x Wireless Adapter   1 x 3.5mm AUX Audio Cable   1 x Optical Fiber Cable Cable   1 x Type c Charging Cable   1 x RCA audio cable   1 x English Manual      Only the above package content, other products are not included.   Note: Light shooting 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.