[4-in-1 Digital to Analog Audio Converter with Bluetooth Transmitter] Optical to RCA Converter supports the conversion of optical or coaxial digital audio signals to analog L/R RCA and 3.5mm jacks. You can also send the signals via Bluetooth transmitter to Bluetooth headset, Bluetooth speaker. [Bluetooth V5.1 Transmitter] Adopts the latest Bluetooth version 5.1 lossless transmission technology. 30m(98ft) Bluetooth transmission range with built-in Bluetooth V5.1 transmitter module. Support Bluetooth headset, Bluetooth speaker connection. [Device upgrade] You can make your old devices , upgrade to Bluetooth mode, such as speakers, TV, etc. Devices can be connected to the AUX/RCA port to solve the problem of not being to connect to Bluetooth. [No Electromagnetic Noise Transmission] The built-in high-performance DAC chip supports sampling rates of 32 kHz, 44.1 kHz, 48 kHz, 96 kHz and even 192 kHz (many others only support up to 96 kHz), ensuring high sound quality. It also supports 24-bit SPDIF input bitstreams for the left and right channelsaudio/video delay, perfect for watching TV/. For stable signal transmission, adopts Bluetooth dedicated antenna. [Plug & play] Plug and play, no drivers required. Help you connect high quality digital audio signals (from TV box, Blu-ray DVD, game console, HDTV and more) to ordinary AV amplifiers, headphones and Bluetooth receiving devices (such as Bluetooth headphones and Bluetooth speakers). Colour:Black Material:Aluminum alloy Package Contents: 1 * Bluetooth Transmitter Receiver 1 * Fiber Optic Cable 1 * Audio Cable 1 * USB Cable 1 * Remote Control 1 * English instruction manual 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.