D33 Waterproof Plug-in Receiver Long Range Wireless DoorbellFeaturesModern and Stylish design - IP44 Waterproof transmitter51 polyphony melodies or 32 music4 Volume adjustable(mute included) or 3 volume - Over 150 meters operation range(open air)Easy to install and use - Learning code function - Low power consumptionParametersVoltage of plug-in receiver: AC 85-260V(US,EU,UK,AU)Power consumption: transmitter<20mA,receiver<140mARating of waterproof: IP44Battery in push button:12V 23A alkaline battery - Operating range: over 150 meters in open area - Selectable ring tone: 51 melodies or 32 music - Volume rang:0-110d - B,4 level or 3 level - Working frequency:433.92Mhz Working temperature: -20-65centigrade - Product List 1 x Receiver1 x Transmitter (12V 23A alkaline battery include)2 x screw1 x double-sided adhesive sticker