Ventouse magnétique dahua 500 KG · 500KG Anti-pull. · Built-in reverse current protection device(MOV). · Aluminum shell with high strength alloy material. · Electromagnetic suction work completely, there is no mechanical failure. · Can be set DC12V or DC24V. · The residual magnetic design proof, wear materials. · Double lock body insulation treatment. · Supports door detector signal feedback. Suction Plate Dimensions 180 mm × 60 mm × 13 mm (7.09" × 2.36" × 0.51") Applicable Door Type Wooden door, glass door, metal door, fire door, etc