Features PRODUCT INTRODUCTION: This is a smart door magnetic sensor that is compact, convenient, and well concealed. Used to detect movement and opening. WIDE APPLICATION: Alarm sensors can be installed on front doors or windows, garage doors, liquor cabinets, front doors, safes, pet doors, etc. EXCELLENT PERFORMANCE: Door magnetic sensor performs with stable performance, low power consumption, long standby time, accurate alarm, and extremely low probability of false alarms. WORK ROUTINE: After the intelligent door sensor works, when someone opens the door, the sensor will automatically activate and send an alarm signal to the alarm host, immediately pushing notifications to you, allowing you to receive the alarm signal and EASY INSTALLATION: Comes with a small size and a light weight as well, this door security sensor can be quickly installed and put into use soon. Specification: Item Type: Door Open Closed Detector Material: ABS Battery: LR03 1.5VAAA battery x 1 700mAh (shipped with matching battery) Frequency: 433.92MHz Standby Current: Less than 40uA Working Current: Less than 100mA Standby Time: Greater than or equal to 2 years Working Temperature: -10 to 60 ℃ Working Humidity: Less than 90% Storage Temperature: -20 ℃ to 60 ℃ Magnet Distance: Less than or equal to Approx. 1cm / 0.4in Low Point Display: LED light flashes once every three seconds Default Encoding: 1527 This machine is equipped with two built in encoding selection switches. Choosing for KS encoding is compatible with our company's alarm host, while 1527 encoding is compatible with various alarm hosts (for GSM) and smart home gateways. Package List:2 x Door Open Closed Detector1 x Manual  2 x Double Sided Adhesive1 x Battery 1 x Screwdriver  Package List 2 x Door Open Closed Detector 1 x Manual 2 x Double Sided Adhesive 1 x Battery 1 x Screwdriver