Feature: Four unlocking modes: remote control unlocking, manual rotation unlocking, one-button internal unlocking, emergency mechanical unlocking, more convenient to use, ensuring your safety at home. independent electronic drive system, imported double motor, more reliable. Simple and convenient installation: equipped with installation accessories, very practical. Low voltage alarm: Remind you to change the batteries. lock is relatively thin.The energy saving control mode, low power consumption, 4 AA batteries (not included) can offer about 1 year of work. An ideal equipment for homes, offices, hotels, apartments, restaurants, dormitories and so on. Specification: Condition: 100% Brand New Material: zinc alloy Color: as the pictures shownFour unlock modes: control unlock remote unlock?ure with manual rotation, internal unlocking with a key, mechanical emergency unlocking Power supply: 4 AA batteries (not included) Battery life: lasts one year Installation method: installation of screws / rivets, adhesive paper Remote control: 4 in this package, maximum correspondence of up to 32pcs Remote control battery: 2032 large button battery Operating temperature: -20 ¡æ to 60 ¡æ Operating humidity: 5% -60% (no frost condition) Item Size: As Pictures Shown Package weight: Approx.?900 g The package includes: 1 * Lock (main body and lock tongue) 1 * antenna 4 * 4 * Remote Controller Bags screws and accessories 1 * Manual