Steely is an alarm system specially designed for doors. It is invisible from the outside of the door after installation. The system has 2 different protection sensors; impact sensor and magnetic contact. Steely can be used with password by means of the keypad on the device as it is activated and deactivated by remote control. Built-in structure that does not disturb the aesthetic appearance of the door. Possibility to use with remote control or password. Specs: Double protection sensor, 2 alkaline batteries, long battery life with custom electronic design, high alarm volume level. There are 2 different protection sensors in the built-in alarm system: Impact SENSOR: It provides alarm to the system in case of impact detection that passes through the meter and threshold value coming to the door. In this case, the malicious person will get away without harming your door. OPENING SENSOR: Using the magnetic field principle, this sensor detects if the door has been separated from the frame and allows the system to alarm if the door is opened. Once the alarm system is switched on, the system will automatically start to alarm if anybody opens the door without using the remote control (including opening the door with the key). For more products please visit our website https://www.electroniclock.com