Review on 🚨 120 dB Motion Sensor Alarm with 5 Door Alarm Modes, 4 Volume Levels – Remote Controlled Indoor Motion Detector Alarm for Home, Shop, and Store by Gary Stringfield

Sensor range and angles appear about as advertised, making each fairly easy to place to adequately cover a typical space. The included USB cable is short but easy to replace if needed, the included cable worked great for my breadboard. While they recognize adequately, they also seem intelligent enough to avoid false alarms when, for example, the convection heating is turned on. So far they have performed very well in my tests. As a cheap way to get early warning of intruders, I'm happy with that. I run them on USB chargers, not batteries. When I hear the audio cut off quickly, that's even more helpful as an early warning. The instructions are ridiculously confusing. They can have all sorts of functions, I can't say for sure. What I've been able to piece together is that when you turn it on, hold down the two side buttons on the detector until it beeps, put it into a useful loud and sustained mode, then press the left arrow to beep for sirens. The bottom latch button then toggles it on (a few beeps to give you time to move away) or disables it.