FIVE WAYS TO UNLOCK - ENER-J's Smart Door Lock will automatically relock after every time the door is used. Approved guests can unlock using fingerprint,ENERJSMART app,user password,RFID card and mechanical key; Support up to 3 master code,100 fingerprints and/or 100 RFID cards (Recommended Operating Temperature: >= -13?). Doorbell function,voice guide for easier and more convenient use. Suitable for 35-100mm door thickness. ENERJSMART APP MONITOR ACCESS REMOTELY - The ENERJSMART app is designed for IOS and Android devices and gives you easy door access and tracking abilities. You can view the access logs in the app for detailed information about who has opened your door,at what times,and how they gained access. EMERGENCY CHARGING AND POWER-SAVING - Equipped with emergency charging port and back up charger. Don't need to worry about being locked outside as you just need 4 pieces AAA batteries to get it back to working. Backlit Keypad for use in night. The backlit keypad will be automatically light up when any button is pressed. Not only convenient and power-saving,but also with smart sensor light that when you enter the correct code the green light will be on. WEATHERPROOF FUNCTION - Made of Zinc Alloy stainless steel that durable and secure. It's easy to clean and not easy to rust. Boasts with weather-sealed components that prevent dust and dirt from entering,allowing it to function in most weather conditions. PRIVACY PROTECTION AND ANTI-PEEPING -Add the random numbers before and after the correct password,the door will unlock as long as the password contains continuous correct password. Temporary Keys-you can schedule temporary keys for visitors or guests. This makes it easy not only to give access,but also to restrict it.