DC 12V Electronic Door Lock Compact Solenoid Valve Lock for Symmetrical Design Power on to Unlock Safety Function Lock Suggested titleSafurance Electronic Lock Catch Door Gate 12V/0.4A Electric Release Assembly Solenoid Access Control New Electronic Latch Lock Catch Item Specifics: Powered form: Interrupted Unlock time: 1 second Input Current: 0.4A;DC12V Approximate Dimension: Length - 27mm; Width - 15mm; Height - 17mm; Tongue Length - 7mm; Tongue Height - 10mm Cable Length: 120mm Instructions: 1)Connect the Red wire to positive and the green wire to negative. 2)Turning the current on will unlock and turning it off will lock the mechanism. Features: Solenoids are basically electromagnets: they are made of a big coil of copper wire with an armature (a slug of metal) in the middle. When the coil is energised, the slug is pulled into the center of the coil. It's basically an electronic lock, designed for a cabinet, safe or door (please check the size). Normally the lock is active so you can't open the door because the solenoid slug is in the way. It does not use any power in this state. When the current is applied, the slug pulls in so it doesn't stick out anymore and the door can be opened. Package Included: 1 x Lock Catch Note: 1.Please allow 1-3mm error due to manual measurement. Please make sure you do not mind before you bid. 2.The colors may have different as the difference display, please understand.