Bluetooth Audio Receiver: Upgrade your non-Bluetooth speakers, home stereo, or car stereo with this Bluetooth adapter to enjoy wireless audio from your smartphone, tablet, or laptop. Easy to set up and connect in seconds. Supports optical fiber, RCA, 3.5mm, AUX, and U disk audio inputs to meet the needs of various audio interface devices. Pair the receiver with your phone or tablet and connect it to your audio system using an audio cable for wireless music playback. Simple plug-and-play operation. Turn the knob to adjust volume and press the track control button to change songs. The built-in display shows mode and volume level for clear feedback. This device requires external power and does not have an internal battery. Plug in the power supply before use. Dimensions: 90 x 77 x 30mm. Material: ABS. Color: Black. Package includes: 1 x host unit, 1 x 3.5mm audio cable, 1 x RCA connector, 1 x Type-C power cable. No other items included. Note: Lighting and display differences may cause slight color variations between the image and the actual product. Measurement may vary by +/- 1-3cm.