Intelligent and Fast Charging: input 12-24 Volt; Output 2 USB ports (PD 20W and QC3.0), allow for simultaneous rapid charging of 2 devices | Special Design: large key for easy operation; 1.7 Inch large LCD backlight display song name/ incoming phone number and shows your car's battery level when car start; Can rotate the LCD display screen in 270 degree gooseneck for optimal viewing comfort; Turn off the FM transmitter: long pressing the next song key for 5 seconds, it will turn off the FM and functions keep charging function | Broad Compatibility: this radio adapter works with compatible devices, like tablet, smartphones, you can transfer music in those devices to car audio via 3.5 mm audio cable; Support TF/ Micro card in FAT format up to 32G; Support A2DP; Support MP3/ WMA format; Also support AUX output | High Clear Sound and Call Quality: adopted advanced interference and noise cancellation technology CVC technology creates full duplex sound and suppresses noise and wind; Built in microphone feature supports hands free talking reduce interference | Features V4.2 and EDR: compared to earlier or older versions like V2.0, V2.1, or V3.0, V4.2 consumes much less energy and lasts much longer; EDR(Enhanced Data Rate), which ensures a faster data transmission rate and much more stable connection between a device and the audio receiver