Headphone Adapter & Splitter, Headphone Jack Audio & Charge Connector Splitter Calling/Charger/Music/Remote Control for iP7/7 plus/8/8 Plus/X/XS/XR/XS/MAX With it, you can charge your extra phone battery ahead of time, no need to spare your phone to charge it anymore. Multiply charge method: with a micro USB cable, you can connect it to a power bank/ PC/ AC power(a adaptor is required). The indicator light will flash to indicate the connect is working, and keeps red when charging your phone battery. Once fully charged, the light will turn green. Compatible Models: For Samsung Galaxy Note 4 Hand-sized body, with built-in over-charge protection.