Integrates into existing security and access control systems; card readers, keypads, telephone entry system, etc. Fail secure system with keyed manual over ride release. Powder coated steel housing proven to withstand up to 3,500 lbs. (1,587.6 kg) of force. DC charger control board and plug-in transformer, Optional but Not Included Battery backup powered - Optional Solar compatible, ideal for remote locations or where AC power is not preferred. Basic mounting hardware (bolt on or weldable), and push button remote mounted control is included in lock kit.