Wi-Fi connection 2.4GHz Not 5GHz, smart doorbell, just download the APP Aiwit and connect to the phone with Wi-Fi of 2 ,4 GHz, and our device can be Wi-Fi connected even outside or through several walls, with reliable connection transmission and strong signal. It is compatible with iOS and Android. Motion detection and night vision The doorbell will send you the message when someone moves in front of the doorbell camera. Equipped with an IR and LED sensor, it allows you to take photos and record videos day or night. Keep your home safe at night. Video Talk-Back and free cloud storage you can watch and talk to visitors on mobile phones and tablets anytime and anywhere and you can transmit video or voice more clearly through noise reduction and adaptive rate technology. free cloud storage with bank protection level. (7 days cyclic storage) Simple installation method The smart doorbell supports two fixing methods: the first method is to use the matching double tape to stick it directly