DC12V small electric lock is 100% Copper coil, all-metal construction, small and durable instant electric lock so it acts to unlock as soon as on power and lock as soon as off power. As a result, it saves much electricity and shares advantages of large voltage, simple structure, handy installation and low usage cost. Nowadays it is widely used among all kinds of bins, cabinets and other open lock occasions. Also it could be matched in use with safe-deposit boxes and lockers in shopping malls. Note: The lock works by solenoid valves principle so it only supports instant electric unlocking but not support long time on power which had better less than 5s. Additionally, it doesn’t support over frequent unlocking actions either and its average unlock internals time shouldn’t be less than 2mins of lowest.