********This item has two power supply specifications: European， Us， and we will according to your shipping address distribution corresponding adapter for you.If you have any special needs， please tell us， thank you.*********Feature:Wireless design， Max. operating range can up to 120 meter in open areaClick Button Transmitter design， lifespan can up to 100，000 Clicks1 million sets of auto-learning codes to avoid interference between doorbellsTransmitter/Bell Push is with IP44 waterproof， and with Flat Panel design， dust-proof， clean and convenient for usingEnergy saving， plug-in Receiver working power consumption is less than 5WMusic and volume are adjustable， comes with 32 chimes， 36 Polyphonic melodiesThe 12V 23A Battery is Not IncludedSpecification:Application: Suitable for villas， apartments， office， hotel， hospital and so onPower Supply (Receiver): AC 110/220VThe plug is USA standard ， for EU AU UK plug standard ， we will send plug adapter together .Power Supply (Transmitter): 1 x 12V 23A Battery(Not Included)Operating Range: 120 meters / 393ft (OPEN AREA)Sound Options: 32 chimes， 36 Polyphonic melodiePackage Content:1 x Doorbell Transmitter (Without Original Packaging )1 x Doorbell Receiver1 x Double-sided Adhesive1 x Screw Set