Product Name: TX13 Bluetooth version: V5.0, Class II Frequency range: 2.402GHZ-2.480GHZ Bluetooth protocol: A2DP AVRCP Power input: DC5V Working temperature: -10-55 degrees How to Use: 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 easily solve the trouble of TV without 3.5mm audio port without Bluetooth speaker. Material:plastic colour:black Package Contents: 1 * TX13 host 1 * Optical fiber cable 1 * Coaxial cable 1 * Audio cable 1 * Charging cable Only the above package content, other products are not included. Note: Light 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.