NON GSM SHUTTER SIRENShutter siren is a typically designed security device to restrict the forced entry into your shops, warehouses, factory shades, garages, etc By opening the locking arrangement of the shutters. The unique electronic safety device raises a loud siren signal even if the locked shutter is tempered even by few inches. Product Details 20 seconds time delay function actives for either side access temper proof device negligible power consumption exclusively