Classic Waterproof Wireless Doorbell - Wireless Long Range Electric Doorbell with LED Indicators, 32 Door Alert Chimes (White, 1 receiver + 1 transmitter), RingPoint Series EASY TO INSTALL. The wall-mountable Sadowado Homekit doorbell includes: 1 receiver, 1 transmitter, screws, anchors, adhesive stickers, and CR2032 battery inside transmitter. LONG DISTANCE RANGE. The homekit door sensor reaches over 500 ft and can penetrate walls and doors. Expand the reach of each door alert by pairing up multiple receivers with just one sensor. CUSTOMIZABLE. With a colorful LED indicator, 32 door alarm sounds and ringtones options, and 5 volume levels (including mute with light). Different tones can also be set to different transmitters. MULTIPURPOSE. Door entry chimes aren't just for receiving home visitors, it can also be used to as a door ringer for business or an alert system for in-patient care. WATERPROOF. With waterproof buttons on the door chime's receiver, you can be at ease with placing to be placed on other outdoor areas other than just as a front door alarm.