CCTV Lens Calculator
Lenscalc – Online Lens Calculator Lenscalc is a universal tool designed to eliminate the frequent errors, mis-readings, and interpolation problems associated with traditional lens calculators. It provides a streamlined solution…
Most places without landline laid, my alarm unable to dial out!
Nowadays major burglar alarms provide a dial-out function so owners of the premised guarded can be informed by phone call whenever there is alarm triggered. In occasions, there is no…
How installation of Pet-immune PIR motion detector reduce false alarm?
Mostly users find there are quite amount of false alarm from PIR motion detectors even those they have been claimed pet immunity. PIR is not so miraculous that can distinguish…