ELECTROMAGNETIC DROP BOLT LOCK MODEL: NOT AVAILABLE · Special design with durable material,safety energized and lockup · Low temperature, safe & durable · Suitable for:wooden doors,glass doors,metal doors,fireproof doors,etc · Connection method:no difference in positive and negative · Made up of stainless steel Detail Description of ELECTROMAGNETIC DROP BOLT LOCK Connection method:no difference in positive and negativeWork mode:safety energized and lockupWorking current:startup:0.45A stable:0.45AWorking voltage: DC