Bests & Worsts Reviews from Amazon

I don't normally write reviews, but have to stick up for this product. I bought it along with 2 additional sensors 1 1/2 years ago. It's the best investment I've made in a long time. I've been monitoring my driveway, deck, and basement door. I installed the unit in my master bedroom so it wakes us up if triggered. However, we can easily hear it downstairs as long as we don't have really loud music on. There is one beep for sensor 1, two beeps for sensor 2 and so on. Some people might miss the "one beep" from a very far away or excessive external noise, but I installed my most active sensor (driveway) to be sensor 3 (3 beeps) and never miss hearing it. The 4 AA batteries I originally installed are still working! Yes, it will take 4-5 minutes to open up the units and change them, but you'll only need to do it ever 1-2 years and there protected from weather inside the sensor. I highly recommended if you value knowing when something is on certain parts of your property and don't mind being woken up occasionally if you have deer, cats, or other animals that wander at night. I live in a suburban neighborhood and already caught one person walking up my driveway at 4AM trying to break into our cars. I've also enjoyed hearing the beeps knowing when someone is coming up the driveway during the day.