1,52 Polyphonic Ringtones: This doorbell provides 52 polyphonic ringstones that you can choose freely, with 4 level optional volume adjustment.2,Remote Connection: This wireless doorbell features a remote connection that won't interfere with other devices in your home.3,Easy Operation: Install it on any regular household socket is ok, do remember to tear up the metal strip protective film before using.4,Low Power Consumption: With ultra low power design, this doorbell is power saving and provides long lasting use.5,Weather Resistance: This doorbell can be used even in harsh weather conditions such as heavy rain, direct sunlight and frost, and can be installed indoors, outside door frames or anywhere in the garden. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.