1.MCU + DSP Dual-core processor, the connection is more stable and the call is more clear. 2.Answer or hang up the phone with a single touch. High definition call quality reduces interference 3.Music play mode, you can play clear stereo music in the car through fm transmitter. TF card / U disk can play more music and supports MP3 / WMA / FLAC / WAV / APE format 4.Dual USB charger, supports charge and overcharge protection for 2 devices at the same time. One USB port (5V / 1A) with a music icon can read USB discs, and another USB charging port (5V / 3.1A Max) can fully charge your smart device. Enjoy car stereo streaming and charge your smartphone at the same time 5.Car battery voltage monitor and LED digital display 6.Suitable for cars with 12-24V voltage.