Strong holding force, no left magnet Easily installed, low noise, durable No mechanical failure With signal feed back function Applications: Can be used with intercoms and access control systems, especially for fireproof door Working Voltage:12VDC、24VDC Working Current: 12VDC/0.27A, 24VDC/0.46A Power Consumption: 3.3W, 3.5W, absolutely insulative Power Supply Mode: successively Working Temperature :- 40℃~50℃