Digital To Analog Audio DAC Converter Adapter Digital SPDIF Optical Toslink To 3.5mm 3.5 AUX Jack RCA L/R Bluetooth 5.1 Receiver Powered By USB Charging (No built-in battery ) We recommend that you use a 5V1A charger to power the adapter to avoid insufficient voltage and current, which may cause current sound or noise when the adapter is in use. It's a VAORLO Bluetooth audio receiver and Digital to Analog Audio Converter only, not a transmitter. Can only be used for audio transmission,So you couldn't use it for your keyboard, mouse, file transfer. (The function of the Bluetooth receiver is to add Bluetooth wireless function to the wired speaker/headphone, so that the Bluetooth-enabled device such as the mobile phone can be wirelessly connected to the wired speaker/headphone through the adapter.) (DAC Mode For TV/PC/Projector/Power amplifier/TV Box/PS4/PS3/DVD.) 3 In 1 Audio Adapter: Mode 1---Digital to Analog Audio Converter SPDIF/Digital Optical Toslink to 3.5mm AUX RCA L/R; Mode 2---Bluetooth 5.2 Audio Receiver: It can add wireless bluetooth function to wired speakers/headphones; Mode 3---Supoort USB U-Disk Play!!! Product Introductions: This Digital to Analog Audio Converter is designed for either home or professinoal audio switching.It converts SPDIF Toslink digital audio signals to analog 2RCA L/R audio and 3.5mm AUX and available for connection to an external device such as amplifier via standard RCA-style/3.5MM aux jacks.This Converter is small in size and quite easy to install. Upgarded: and we have upgraded the converter, its have bluetooth audio receiver function, so you can use your phone to pair with your wired speaker/car systerm/wired headphone/amplifier via bluetooth. Product Features: 1. Converts toslink digital audio signals to analog 2RCA L/R and 3.5mm aux audio; 2. Available for connection to an external device such as an amplifier via standard RCA / 3.5mm aux jacks; 3. Supports sampling rate at 32,44.1, 48 and 96KHz; 4. 24-bit SPDIF incoming bit stream on left and right channels; 5. Digital Optical Toslink Signal to Analog Audio Converter is designed for either home or professional audio switching; 6. It converts Toslink digital audio signals to analog 2RCA L/R and 3.5mm aux audio and available for connection to an external device such as an amplifier via standard RCA-style jacks; 7.Super Stable Connection:Our Bluetooth audio adapter is fitted with a Bluetooth 5.1 chip for steady pairing, fast transmission and a wide signal range (33 feet). With the 3.5mm AUX port and 2 RCA port, it can be connected to non-Bluetooth car audio systems, home stereo, wired headphone/speaker, Amplifier/Home Theater.etc. Then you can enjoy wireless Hi-fi music streaming!( Note: It's a vaorlo Bluetooth receiver only, not a transmitter. So you couldn't use it for your TV, keyboard, mouse.); 8.Support volume adjustment and song switching; 9.Upgraded to support U Disk to play; 10.Built-in antenna, the signal transmission is more stable,the sound more clear, no noise; 11.Receiver Mode For Wired Speaker/Home Speaker/Power amplifier/Headphone/Car kit; 12.DAC Mode For TV/PC/Projector/Power amplifier/TV Box/PS4/PS3/DVD. Product Parameter： Brand:VAORLO Product Name: 2-IN-1Bluetooth Audio Receier & DAC Audio Converter Model: BLS-B35 Frequency Response:10Hz-20kHz Signal to Noise Ratio:110dB Distorion+Noise:0.02% Bluetooth Version:V5.1 Effective Distance:20M Performance:Hifi Support:A2DP/AVRCP U-Disk Support:WAV/WMA/APE/FLAC/MP3 Product Size:86*65*25mm Package included: (Standard Edition) 1x DAC Bluetooth Audio Adapter Converter 1x 3.5mm Aux audio Cable 1x Type-C Charging Cable 1x User Manual （If you purchased the "Standard Edition", there is no "Optical Fiber Cable" and "RCA Audio Cable"） Package included: (Deluxe Edition) 1x DAC Bluetooth Audio Adapter Converter 1x 3.5mm Aux audio Cable 1x Type-C Charging Cable 1x Optical Fiber Cable 1x RCA Audio Cable 1x User Manual