This is a bundle which contains 2 items
Battery Holder: Simple and convenient: Mount the battery to the the headband of goggles, scroll the cable on the clip/mount/holder, balance weight and frees you from that annoying wire dangling
Skin-friendly Lanyard: Free your hands and prevents you from dropping your remote control and mobile phone
After-Sale Service: 1 year warranty. Any questions or quality issue will be answered or solved within 24 hours