4 in 1 FUNCTION: This iPhone splitter has 2 Lightning Port, one port is for Charging, another is an audio port. the charging port is just for charging, and the audio port can be used for listening to music and calling, also it is wire control, you can control the music and call through the earphones. COMPATIBLE DEVICES: Support iPhone Xs Max, Xs, X, iPhone 8 / 8 Plus, iPhone 7 / 7 Plus, the dual lightning adapter is perfectly compatible with iOS 10 and above.SMART CHIPS & HD SOUND QUALITY: Supports up to 48 KHz and 24-bit audio output, keep apple lightning earpods sound quality with no compromise. Also supports 3.5mm AUX in the car. MINI & PORTABLE: The dual lightning adapter is very small, light and compact. You can put it in your bag, wallet, briefcase or pocket so you can carry it around. Listen and charge your phone at the same time will not be a problem anymore!