Wireless Doorbell Kit for Home 2 Buttons and 2 Plug-in Receivers Waterproof Operating at over 1000-feet Range with 36 Chimes, 4 Volume Levels Loud Enough for Elderly, No Batteries Required for Receive EASY INSTALLATION - BASIC TOOL PROVIDED : Plug-in receiver (No Batteries Required) with 2-Pin US plug is suitable for an electrical outlet(AC). Affix the push buttonTransmitter (23A Alkaline battery provided) to the wall with the enclosed double-sided adhesive tapes. LONG RANGE - STRONG PENETRABILIBY : Operating range up to 1,000ft/300m in open area, penetrating steel doors, exterior walls and interior walls, which ensures that you don't miss any of your vistor, no matter in which room you are. ECONOMICAL KIT - FOR HOME & BUSINESS : 2 plug-in receivers and 2 remote waterproof transmitter buttons allow you to install the button to the front and back door and have receivers in different places of the hourse. Modern design with classic white are perfect for both home and for business. LOUD ENOUGH - FRIENDLY FOR SENIORS : 4 levels of volum for you to choose from, loud enough for elderly or hardhearing people. Your parents might like this very much as a considerate gift MORE THAN A DOORBELL - MULTIFUNCTIONS : Whith 36 beautiful chimes, this doorbell could serve as a senior care pager for home or for institutions providing caring service, so the seniors or patients could get help when they need assistance. It comes with two receivers that can be placed anywhere in your home, thanks to the transmitter&#039;s long range of 1000ft, and is available in a variety of classy finishes. Missing important deliveries, visitors or clients will be a thing of the  past when you install this fantastic Wireless Remote Control Doorbell. It comes pre-synced, you don&#039;t have to do extral matching setting. Classic White fit perfectly for most building. Can adjust the volume level, according to the different environment and different groups of people to adjust the volume (suitable place: rent house, family, hospital, school, company) A wide selection of 36 melodies allows you to easily choose one to suit your preferences - enough for a new tune every week of the year, so you will never get bored with your doorbells chimes again. It is easy and simple to choose your favorite melody.