NB: Need GSM alarm system (tuya)

• Wireless magnetic contact sensor
• The sensing element is a magnetic contact reed switch
• The minimum sensing distance is 10mm. Before attaching the sensor housings, please check the position of both elements in the intended installation location for the activation of the sensor when the magnet is removed. If the distance between the elements is more than 3 cm when the sensor is activated, rotate the body of the receiving part 180 degrees and check that the sensitivity has significantly improved.
• Works with most WiFi GSM alarm systems.
• Low Battery Indicator The feedback feature can alert the user of an open door or window while arming.
• It is available if the alarm panel supports it.