No battery required & expandable】: never need any battery for both button and receivers. Anti-interference wireless doorbells for home reach across entire house can work for different rooms or floors without affected by walls between, the wireless doorbell supports multi wireless portable door bell push button transmitters & multi receivers door bell chime wireless.
Wireless Doorbell, Excelvan Waterproof Door Bell Chime Kit with 2 Plug-in Receivers and 1 Push Button, 58 Melodies Chimes, Night Light and LED Indicator, Long Operating Range for Home Office White - There are 4 notification modes for your preferences : mute LED flashing only / ringing only / ringing and flashing/ringing and LED flashing all the time. The receivers have memory function, Christmas tunes, you don't need reset to your previous settings. Ideal night lights & 4 notification modes】: built-in smart light sensor and infrared sensor, the receiver can provide the soft light with LED Indicator as a nightlight.
. Because of the pir sensor, when the human body passes the detection range at night, it can be turned on 35s. The portable wireless door bell push button can work as an alert device, office, pregnant, fair sound alarm & training bell for the door. Easy to installation & warranty】: includes 1 transmitter buttons and 2 receivers, 2 screws, 2 anchors, 1 double-sided adhesive sticker for easy installation of the transmitter.
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