Door Chime, Wireless Door Open Contact Sensor Alarm with 500 FT Range, 58 Chimes and 5 Volume Levels for Business/Store/Home/Office When Entering, 4 Transmitters + 2 Plug-in Receivers

Easy to InstallThe sensor and receiver come pre-paired, so all you have to do is mount the transmitter, plug the receiver into any standard outlet, select a tone you prefer, and you are ready to go. Built to LastUsing just one standard household AAA battery and an Ultra-Low-Power design, the sensor can easily operate for 1-2 years, meaning the battery needs to be changed less often, saving you both time and money. A Must-HaveA dependable 500FT long working range delivers a perfect entry alert chime when a door opens, ideal for home and business use.

What about an insecure front door, child safety gate, upstairs window, cabinet, basement door. you decide. Mute to 120dB58 unique long and short tones are available with 5 adjustable volume levels. The maximum volume of 120dB is loud enough to be heard anywhere in the house, so you will never miss an alert. Prefer not to be disturbed? Set it to mute