1. Uses electric control for unlocking, unlocked with a button indoors and with a key outdoors, anti-theft, high safety factor. 2. Power on to unlock, power off to lock, and the unlocking direction is left opening. 3. The internal structure of the lock has been further improved to further ensure safety, which is reliable to use. 4. The installation is simple, requiring no complicated operations or tools. 5. Suitable for residential buildings, institutions, schools, dormitories, hotel buildings, factory warehouses and can be used with electronically controlled security doors. When you buy our products, you not only get high quality, but also the benefit of our thoughtful customer service. Our customer service team is always ready to provide you with help and support.