Smart home wireless battery power button doorbellWorking frequency:315MHzChime Sound: 80~90DBPower supply for receiver:3.0bV/DC 2*1.5V AAA (excluded)Power supply for button:1*12V 23A Alkaline batteryDistance:100M (open area)Sound Type:32 pieces melodiesmusic for optionLED indicator:Door bell can be built-in indicatorPacking list:1 x doorbell,1 x receiver,1 x battery for buttonFeatures:LEDlightflashingdesignbringsconveniencetothehearinghandicappedClassicalsimpleandnicebuttonThirtytwomelodiesmusicforoptionProfessionalremotecontroltechnology,canbeinstalledatanyplace,nowiringSuitable for house, office, hotel, school, outdoor building etcEasy to install & easy to work