Durable and Easy to Install - Long service life, made of zinc alloy stainless steel, durable and never fade. Simple and stable installation thanks to the external mounting plate. Bottom panel design makes installation easier and more stable. Remote Control & Safety: Digital Talk System Remote Control, Can Not Be Decoded or Duplicated. Anti-theft and bring you security. With 4 remote controls, you can put these keys in various places in the house, such as bedside table, coffee table, dining table, etc., anywhere you want. Energy saving control mode: low power consumption, 4 AA batteries can offer about 1 year working time(not include 4xaa batteries). This smart lock has a long service life, 300 thousand locking operations, no wear. Once the main batteries run out, you can use the buffer battery without worrying about empty batteries and be closed outdoors. Energy saving and backup battery: energy saving and low battery consumption. Before the main battery runs out, the lock will issue an alarm to remind you that it is time to replace the battery. Don't worry if the battery runs out, the backup battery will work to help you unlock. Once the main batteries run out, you can use the backup battery, without worrying about low battery and locked outside. Wide Application - An essential choice for family safety. Ideal for office, home, hotel, anti-theft door, corridor door, wooden door, garage door, etc., Weight: 2.2928075248 pounds, Manufacturer: QOTSTEOS