Bluetooth Audio Receiver: Upgrade your non-Bluetooth speakers/home stereo/car stereo with this bluetooth adapter so you can enjoy wireless audio from your smartphone, tablet or laptop. Easy to set up and connect in seconds. interfaces and compatibility: support for optical fiber/RCA/3.5mm/AUX/U disk audio, to meet the needs of audio interface devicesEasy Setup: This bluetooth receiver can be paired with your phone or tablet, and connected to non-bluetooth speakers/home stereo/car stereo via audio cable, then enjoy wireless music. Simple plug and play.Volume Control and Visual Indicators: Turn the knob to adjust the volume, press the "Less than" key to adjust the music track. Readable screen tells you mode and volume so you're never confusedThere is no battery in the Bluetooth adapter. Please connect the power supply before use.size: 90 x 77 x 30mmMaterial: ABScolour: blackPackage Contents: 1 x host1 x 3.5 audio cable1 x RCA connector1 x Type-C power cordOnly 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.