Wireless Doorbell, Wireless Door Bells Chime Kit with Adjustable 36 Melodies and 2 Receivers, 4 Volume Levels, Door Bell for Home, Office, Classroom EXQUISITE WIRELESS DOORBELL KIT】: This portable wireless doorbell just requires you to take out the insulating sheet behind the button and put the battery inside the receiver to use. It contains an outdoor remote doorbell button, two wireless doorbell receivers, screws, and a portable note. 【AUTO-CONNECTED ALARM BELL】: Our wireless doorbell kit is paired before leaving the factory, you don't need to pair it again to use it, even the elderly at home can use it very conveniently. As a warning bell, the elderly can press the button in time to notify other people at home when they encounter danger at home, so as to avoid unfortunate events. 【LONG-DISTANCE STABLE SIGNAL TRANSMISSION】: We use radio signal transmission to enable our equipment to ensure effective and stable signal transmission. Two receivers ensure that you can hear the doorbell in time anywhere in your home. 【RICH SELECTION OF SOUND EFFECTS AND 4-LEVEL VOLUME ADJUSTMENT】: This wireless doorbell set provides 36 kinds of sound effects for you to choose from, and the rich sound effects will definitely allow you to choose your favorite ringtone. At the same time, this doorbell receiver has 4-level adjustable volume, even the elderly can easily hear the sound of the doorbell. 【RELIABLE QUALITY AND STABLE PERFORMANCE】: This wireless doorbell set can operate