DaytechWireless Door Chime, Door Dinger for Business Entry/Store/Home/Office, Door Alarms When Opened with 800 Ft Range,55 Chimes 5 Adjustable Volume 2 Sensors + 2 Receivers

Une grande solution je la suggère

Works great and very easy to set up

Gave to my daughter who hot glued it to her front door. The sticky tape was not enough to hold it onto the door.

The battery life is so bad it only lasts 1.5 weeks in a store front door, make sure you buy lots of extra batteries.If it stops working all together going in the garbage.

I purchased the set of 2 sensors and 2 chimes for my shop. I pulled the battery tab from each sensor to activate the sensors, then installed on the front main entry door and the other on the shipping/receiving door. I plugged in one chime in the back office area and the other in the warehouse. BAM, it all works.I should add the main entrance sensor is about 100 feet to the chime in the warehouse with multiple walls in between and it works perfectly. Each sensor sounds both chimes which I really like. I then adjusted the chimes type and the volume level. You can turn the volume off as well.This is a completely independent wireless system with no connection to WiFi. Very quick and simple to install.Lastly, the sensors do have a watch type battery. I have no idea how long they will last, but I imagine they will last for months before needing a battery replacement.