Door Chime, METAK Wireless Door Open Contact Sensor Alarm with 500 FT Range, 58 Chimes and 5 Volume Levels for Business/Store/Home/Office When Entering, 1 Transmitter + 1 Plug-in Receiver

😀【Easy to Install】The sensor and receiver are paired already, all you need to do is attach the transmitter, plug the receiver into any standard outlet, pick a tone you like and here we go.
🔋【Built to Last】With one standard household AAA battery in equipment and design of Ultra-Low-Power, the sensor can easily last 1-2 years. which allows battery to be replaced less often, save your time and money.
✔️【A Must-Have】500FT reliable long working range, perfect entry alert chime when door opens for home and business. What about insecure front door, child safety gate, upstairs window, cabinet, basement door…you tell me.