Features: new and high quality TX13 is a Bluetooth-compatible adapter with optical fiber, coaxial, 3.5mm Bluetooth-compatible transmitter and digital to analog dual-use. It is powered by USB 5V. It enters the search and pairing state when it is powered on, and the red light flashes quickly. It can wirelessly transmit music from mobile phones, walkmans, TVs, computers and other devices to your Bluetooth-compatible receiver, stereo Bluetooth-compatible headset, Bluetooth-compatible speaker and other devices. It can be directly converted to a 3.5mm analog signal through the product's optical fiber coaxial digital signal, and the optical fiber coaxial audio input 3.5mm output is connected with speakers, power amplifiers and other equipment through audio lines to achieve digital to analog conversion. Switch the interface light through the button and switch the input interface. Specifications: Product Name: TX13 Bluetooth-compatible Transmitter Bluetooth-compatible Version: V5.0, Class II Frequency Range: 2.402GHZ-2.480GHZ Bluetooth-compatible Protocol: A2DP AVRCP Power Input: DC5V Material: ABS Size:approx 89 x 54x 20mm/3.5x2.12x0.78in Note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. Package includes: 1x Bluetooth-compatible Transmitter 1x Optical Fiber Cable 1x Coaxial Cable 1x Audio Cable 1x Charging Cable 1x Manual