Bluetooth chip uses a USB direct power supply and does not require charging, so the adapter can be used with a direct power supply through the speaker USB port.The bluetooth-compatible receiver has no requirements for the system and is suitable for speakers, cars and power amplifiers.It has bluetooth-compatible 5.0 and a transmission distance of 0-10m(about 33 feet), which is faster and more stable than the bluetooth-compatible 4.0 version.The receiving function of the bluetooth-compatible adapter turns the ordinary speaker into a bluetooth-compatible speaker, so that the car without bluetooth-compatible has the bluetooth-compatible function, so you can easily listen to music, make calls, use the mobile phone to navigate and play in the car.It supports multiple audio mode playback and also supports audio devices with USB ports and 3.5mm jacks.Item Name: bluetooth-compatible 5.0 Audio ReceiverMaterial: ABSAudio Interface: USB and 3.5mm JacksFeatures: Plug and Play, Faster Transmission Speed, Stable, with Receiving Function, PortableSize: 4cm x 4cm x 2cm /1.57" x 1.57" x 0.79" (Approx.)Notes:Due to the light and screen setting difference, the item& 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 5.0 Audio Receiver1 x 3.5mm Cable1 x User Manual