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. Interfaces and Compatibility: Supports optical fiber, RCA, 3.5mm, AUX, and U disk audio to meet the needs of various audio interface devices. Easy Setup: This Bluetooth receiver pairs with your phone or tablet and connects to non-Bluetooth speakers, home stereo, or car stereo via audio cable for wireless music playback. Simple plug and play operation. Volume Control and Visual Indicators: Turn the knob to adjust volume and press the "Less than" key to change music tracks. The readable screen displays mode and volume levels for clear feedback. This Bluetooth adapter does not include a built-in battery. Please connect to a power supply before use. Size: 90 x 77 x 30mm Material: ABS Color: Black Package Contents: 1 x Host 1 x 3.5mm Audio Cable 1 x RCA Connector 1 x Type-C Power Cord Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement may vary by +/- 1-3cm.