Stainless Steel RFID Spa Swimming Pool Gym Electronic Cabinet Lockers Lock with Master Key EM126Features : Single card (guest card can unlock alone) or dual card (guest card and waiter card can unlock at the same time) to open, you can set it at any time according to the need. Automatic rebound function: no need install door handle, just open by card, then 5 7seconds later lock will bounce off automatically, even special type door hinges can also be opened smoothly. When you close the door then the locker be locked. Low voltage alarm indication