Review on SadoTech Necklace: A Wireless Medical Alert System For Caregivers And Seniors by Herve Latreche

It's very simple to use- and works great. We use it as a call button for my disabled father whose room is on the other side of the house. But it would work as a wireless doorbell too.You need to replace the 3 watch batteries about every 6 months and there are no instructions for doing so. btw use a box cutter to pop it open.