WiFi Smart Doorbell and Alarm Transmitter and Receiver with Plug-in Chime 58 Melodies 5 Volume Levels Mute Mode

Features:
Wireless doorbell (transmitter) and plug-in chime (receiver), easy to install and use. Compatible with 'Smart life' APP, easy to be controlled via 2.4GHz wifi connection.
With 58 melodies and 5 volume levels (include mute) to meet diverse requirements, and colorful indicator light ring to present different status.
It can be expanded with multiple receivers and be set the independent ring tines for each transmitter, and remembers your last-set melody and volume level after a power outage.
The transmitter uses a CR2032 lithium battery which has long lifespan. The backup battery built in the receiver provides power operation for up tp 5 hours if the building has lost electrical power.
It's also a wifi wireless security receiver supporting connection with door/ window sensor, human infrared sensor and more via the wireless protocol. If any problem occurs, a door or window opens and closes or somebody is visiting, you will be notified immediately.