This electric deadbolt NC door lock makes the door unlock until the power is cut off, adopting NC mode - (locked while supplied with power) and fail safe mode,be suitable for wooden door, glass door, metal door, fireproof door, etc.Features:Brand new and high quality. Built in voltage spike suppressor , safe and stable. Made of high-strength aluminum lock body,stainless steel bolt,durable and compact. The new structure optimization design, more stable and more secure. Ultra-low-power design,more durable and more environmentally friendly. 500,000 times power locks durability, complete product specification, for all types of locks installed. Specifications:Operating Mode: NC (locked while supplied with power), fail safe modeMaterial: Aluminum AlloyVoltage: DC12V, 1ACurrent:Start: 0.45AStandby: 0.45ASize(LxW): Approx. 2.5 x 9.0cm or 1.0x3.5in (Magnetic base)Size(LxWxH): Approx. 20.5 x 3.4 x 4.5 cm or 8.0x1.3x1.7in (Main body)Package Weight: 545g or 19.2ozPackage List:1 x Electric Deadbolt Drop BoltLock1 x Magnetic Base1 x Faceplate1 x User Manual4 x ScrewNote:The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness..