The EB-185 Electric Dropbolt is a Fail-Safe Version (Power to Lock) with a self-regulating power input of 12/24VDC. Stainless Steel Face Plate with Auto-relocking Time Delays of 0, 3, 6, and 9 seconds to choose from. Current Draw of Pull in: 0.9A and Holding: 0.3A@12V DC at temperature of 20. It also have a Magnetic bolt relay contact output to indicate the bolt lock and unlock status. Operating Temperature of -10 ~ +45 and Humidity of 0~95% non-condensing. Built-in logical circuitry and have been tested to 500000 cycles.