[Dimension] - Cable Length: 25cm/9.8"; Overall Size: 31.5 x 15 x 7.6mm/1.24 x 0.59 x 0.3inch
[Material]: Magnetic switch alarm has zinc alloy casing for better oxidation resistance
[Normally Open] - NO means normally open: when the magnet separates, the circuit is conductive ; When the magnet is attached, the circuit is non-conductive . When you order, check carefully.
[Applications] - The rolling door is designed for use with door and window alarm systems, such as garages, industrial warehouses and shops, etc.