LSDA BMAG electro-magnetic locks secure doors with 600-pound or 1200-pound holding force and no moving parts. Built-in features include an unlock delay timer, magnetic bound sensor with LED status and form C output, and external status relay. Locks require 12V DC or 24V DC current external switching devices to activate unlocking (fail-safe). These lock are recommended for use on interior or exterior doors. Typical applications include office buildings, retailers, industrial sites, banks, warehouses, and government buildings.