Bluetooth 5.0 two-in-one receiver and transmitter RX: You can easily upgrade ordinary speakers, power amplifiers, and car speakers to devices with Bluetooth, enabling wireless Bluetooth operation on mobile phones! TX: , computers, and projectors can be upgraded to devices with Bluetooth for remote operation! Humanized LED indicator light makes the operation easier to understand, and the fool-like operation is clear at a glance. 3.5mm audio interface, application range! Hands-free calling, one-click answer, while driving! Built-in 150MA battery, super long battery life, ≥7H, more worry-free use! The product does not require drivers or APP! color: Black material: plastic Package Contents: 1 x charging cable 1 x 3.5 audio cable 1 x 3.5 audio head Only 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.