WIFI REMOTE: When a visitor presses the doorbell, it will push the reminder to the mobile app on the phone. You can associate up to 100 wireless accessories and 10 remote controls. It is very convenient and safe to use. EASY TO INSTALL: Includes 1 button and 1 plug-in receiver, easy to install, allows double-sided tape and screw installation. Using a door/window sensor or a human infrared sensor (not included), your doorbell will be immediately upgraded to a burglar alarm. LOW POWER CONSUMPTION: Built-in back button battery, standby time up to 2 years; IP55 dustproof and waterproof; the ambient temperature is -20C to 60C; withstand even the harshest weather conditions. SAFETY: With power-off memory function, all settings can be saved after power-off. The low battery alarm will remind you to charge the doorbell in time and has a tamper alarm. When someone breaks the doorbell, the host sends an alarm. SCOPE OF APPLICATION: The doorbell is suitable for families, schools, businesses. The home application can effectively protect the safety of family members, and can also provide convenience for the elderly at home.