... 1.Lock : 203*33.5*42.5mm 2.Delay locking setting 3.Working voltage: 12VDC~24VDC 3 ... .Type: fail safe (unlock when power fails) 2.Time delay locking setting: unlock by power fails 0S,3S,6S, ... system 3S,6S,9S,15S are available general delay locking time is 1S 3.Working voltage: 12VDC~24VDC Working ... control system and building intercom system. 9.The Time-delay setting for lock and unlocking are independent