Aerb Portable Remote Wireless Door Bell Kit LED Flash 36 Melodies Chimes W 1 Touch Button Transmitter and 1 Receiver, Black UNIQUE TOUCH ACTIVATED - Led lights up when touching the touch area of transmitter button, it is the unique design and very smart even if in low volume or insufficient light conditions; LONG EFFECTIVE RANGE - Operating range of over 500 feet (1000 feet in open area). Either you are occupied in the kitchen or in the living room, it can alert you the calling from outside; ADJUSTABLE RING TONES Over 36 different melodies chimes to choose and four levels of adjustable volume from 25Db to 110Db, more comfortable to your hearing preference; EASILY INSTALLATION KIT - 3M adhesive transmitter & Plug-in receiver, easily plug receiver into an electrical outlet (no batteries required for main receiver) and tear the adhesive tape to finish the installation; PRACTICAL LEARNING FUNCTION - Remote control switch and waterproof function is designed to provide elegant and practical alerts for multi environment purpose, like home, office and hotels .