Let me start by saying this KERUI alarm kit is a budget-friendly beast. The 115dB siren isn't joking around - I tested it in my garage and nearly gave myself (and my dog) a heart attack. For under $70, you're getting a full wireless setup with door sensors, motion detectors, and remotes that feel surprisingly sturdy.

The good stuff first: Installation was stupidly easy. I had the whole system up in 20 minutes - just peel-and-stick sensors and mount the siren. The remote arming/disarming works flawlessly from across my 1,500 sq ft house. During testing, the motion sensors caught every movement without false alarms (even when my cat tried to sneak past).

Now the quirks: That instruction manual situation is REAL. I almost panicked when I misplaced mine because the online resources are... let's say 'translated creatively'. Pro tip: Record your setup process on your phone for future reference. Also, the 6-second sensor triggering window during setup had me resetting twice before I got the timing right.

Real-world performance: After three months of use (including through winter), it's only given me one false alarm during a power outage. The battery life seems decent - I'm still on the original batteries. That piercing siren? It absolutely works - my neighbor came running over thinking there was an emergency when I tested it.

Who's this for? Perfect for renters, construction sites (like that reviewer mentioned), or as a secondary alarm system. Would I trust it alone to protect Fort Knox? No. But for deterring casual intruders and giving peace of mind? Absolutely worth every penny.

Final verdict: 4/5 stars - loses one star for the manual situation and power outage sensitivity. Just don't lose those instructions!