C20 Bluetooth FM Transmitter for Car Dual USB Charger MP3 Player with Colorful LED Light Hands Free Calling Audio Adapter Features： 1、Colorful breathing lamp, seven color light self adjustment. 2、Built in high-performances decoding module, with BT5.0 lossless transmission, high resolution and high-performances stereo sound, more impressive sound quality. 3、Power off memory playing function, automatic reconnection. 4、Dual USB interface design. 5、Efficient conversion of electricity. 6、After connecting BT, insert the U-disk and memory card, and double-click to adjust the mode. 7、Built in microphone, one button handsfree call, clear and smooth, safer driving. 8、Increase the buckle area, lengthen the antiskid spring pieces on both sides, and the buckle is stable without fear of bumpy roads. Specification： This product makes it easier to answer your phonecall while driving. Keys design is simple, easy to operate, driving safer. Features: Colorful breathing lamp, seven color light self adjustment. Built in high-performances decoding module, with BT5.0 lossless transmission, high resolution and high-performances stereo sound, more impressive sound quality. Power off memory playing function, automatic reconnection. Dual USB interface design. Efficient conversion of electricity. After connecting BT, insert the U-disk and memory card, and double-click to adjust the mode. Built in microphone, one button handsfree call, clear and smooth, safer driving. Increase the buckle area, lengthen the antiskid spring pieces on both sides, and the buckle is stable without fear of bumpy roads. Specifications: Color: black, silver (optional) Frequency response: 20Hz-15KHz BT: 5.0 Working voltage: 12-24V FM transmission frequency: 87.5-108.0MHz Transmission distance: 10-15m Package size: 130 * 68 * 49mm / 5.1 * 2.7 * 1.9in Package weight: 53g / 1.9ounce Packing List: 1 * Auto Audio Player Package List： 1 * Auto Audio Player