TX13 is a dual- Bluetooth adapter with optical fiber. Coaxial. 3.5mm Bluetooth transmission and digital to analog. It uses USB5V power supply. When it is powered on, it enters the search and pairing state, and the red light flashes quickly. It can transfer music from mobile phones, walkman, TV, computer and other devices to your Bluetooth receiver, stereo Bluetooth headset, Bluetooth speaker and other devices wirelessly.Can be directly converted into 3.5mm analog signal through the product optical fiber coaxial digital signal, optical fiber coaxial audio input 3.5mm output and speaker, power amplifier and other equipment connected by audio cable to achieve digital analog conversion.Switch the interface light through the button to switch the input interface.Connect the USB cable to the 5V charger, the product starts to enter the red light flash mode to search, turn on the Bluetooth speaker Bluetooth headset. Automatic pairing is carried out, the red light is on when the pairing is successful, and the product selects the optical fiber or coaxial 3.5mm audio cable to connect to the TV / computer through the button switch interface. The blue light corresponds to the interface. The TV or computer must be set in external speaker mode.Digital to analog signal, connect TV fiber or coaxial connection product, 3.5mm audio cable to speaker. It can solve the of TV without 3.5mm audio port without Bluetooth speaker.Product Name: TX13Bluetooth version: V5.0, Class IIFrequency range: 2.402GHZ-2.480GHZBluetooth protocol: A2DP AVRCPPower input: DC5VWorking temperature: -10-55 degreesColour:blackMaterial:ABSPackage Contents:1 x Bluetooth adapter kitOnly 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.