What 2 In 1 Audio Adapter: A.Digital to Analog Audio Converter SPDIF/Digital Optical Toslink to 3.5mm AUX RCA L/RB.Bluetooth audio receiverIntroductions: 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: 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. 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. Provides electromagnetic-noise-free transmission 6. Easy to install and simple to operate 7. Compact size and light weight 8. Digital Optical Toslink Signal to Analog Audio Converter is designed for either home or professional audio switching 9. 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 10. This Converter is small in size and quite easy to install. 11.Upgraded to have bluetooth audio receiver functions. 12.Super Stable Connection: Our Bluetooth audio adapter is fitted with a Bluetooth 5.0 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 vikefon Bluetooth receiver only, not a transmitter. So you couldn't use it for your TV, keyboard, mouse. 13.Auto On When you connect to the power, So its very good for to use in car or other you want it have auto on functions. 14.Connect two devices: Support to connect with 3.5mm audio port and 2 RCA audio port at the same time. 15.Auto-Connect: This Bluetooth receiver will automatically connect to the last paired Bluetooth device when you turn it on the next time. 16.Support volume adjustment and song switching. 17.Upgraded to support U Disk to play. 18.Built-in antenna, the signal transmission is more stable,the sound more clear, no noise. Package included: 1* 2 in 1 adapter 1* 3.5mm Aux audio cable 1*Optical Fibercable 1* Type c charging cable NOTE:Don't built-in battery (Powered by usb charging) About Using Question First. the device has RX and Digital to Analog Function. Blue Color is meant RX mode Red Color is meant Digital to Analog mode Second, RX mode is not support Optical function. so