Specifications: This is a dual-purpose bluetooth-compatible adapter, which supports bluetooth-compatible transmission and digital to analog conversion. It is powered by USB 5V. When it is powered on, it enters the search and amp; pairing state, and the red light flashes quickly. It can wirelessly transfer music from your mobile phone, TV, computer to your bluetooth-compatible receiver, stereo bluetooth-compatible headset, bluetooth-compatible speaker and other devices. You can press the button to switch the interface lights and switch the input ports. Item Name: bluetooth-compatible Audio Transmitter Material: ABS Bluetooth Version: V5.0 Frequency Range: 2.402GHz - 2.480GHz Power Input: DC 5V Working Temperature: -10 Degree Celsius - 55 Degree Celsius Input: Optical Fiber Input, Coaxial Input, 3.5mm Audio Input Features: with Antenna, Plug and Play, Easy to Use Size: 14.4cm x 9cm x 4cm/5.67 and quot; x 3.54 and quot; x 1.57 and quot; (Approx.) Notes: Due to the light and screen setting difference, the item and 39;s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x bluetooth-compatible Audio Transmitter 1 x Optical Fiber Cable 1 x Coaxial Cable 1 x Audio Cable 1 x Charging Cable 1 x User Manual with Antenna, Plug and Play, Easy to Use ABS bluetooth-compatible Audio Transmitter with Antenna, Plug and Play, Easy to Use ABS