EASY TO SET UP: Can be installed simply by just fixing the transmitter on the wall without any wiring.300 M/1000 FT LONG WIRELESS RANGE: 2 plug-in receivers included; will not interfere with other equipment in your home or those of your neighbors; ensures you will never miss a visitor・ even if you are a few rooms away or on another floor36 Different Ringtones - There are 36 different ring tones with 4 levels of adjustable volume from 20db to 80db. Flashing light with audio alert indicators which is easy for people including the hearing impaired to notice.Easy Installation: Easily plug receiver into an electrical outlet (no batteries required for main receiver). The push button can be fixed to the doorframe with the attached adhesive tapes. The push button is rated IP44 weatherproof and acceptable for outdoor use.1 YEAR WARRANTY!: 100% money back satisfaction guarantee within 1-year warranty! With nothing to worry about・ try it today! Specifications:Color: Classic whiteOperation range:656ft-984ft (maximum in the open air)Tunes: 36 optionsVolume: 4 adjustable levels (20db to 80db)Operating frequency: 433MHZReceiver working voltage: AC 90-260vReceiver Power: 0.25WTransmitter Voltage: 12V Alkaline Type A23 batteryWaterproof (Transmitter): IP44Package Contents:1 x Remote Push Button (Transmitter)2 x Plugin Chime (Receiver)1 x Double-Sided Adhesive Tape1 x 23A 12V Alkaline battery for transmitter1 x Battery Cover Opener1 x Manual