Description:This set of magnetic detecting switch monitors the opening and closure of doors and windows used to protect doors and windows for the most part. It is great for installed on doors of house, garage, warehouse, enterprise and shop etc. Features:This is a set of magnetic detecting switch used to protect doors and windows for the most part. Protective device monitors the opening and closure of doors and windows. 433MHz transmitting frequency, wireless connection. High quality magnetic sensor contacts with strong magnetic, sensitive respond and long durability. Easy to install and use. A good replacement for the old contacts. Simple to install no hassles. Specifications:Condition: 100% Brand NewMaterial: ABS Plastic Color: As Picture ShownOperating Voltage: 1.5VBuild-in Battery: 1 * AAA LR03 AM4 1.5V 800mAh Dry BatteryBattery Life: About 8 monthsStatic Current: 10uAOperating Current: 15mATransmitting Frequency: 433MHzTransmitting Distance: 100m (open area distance)Door Magnet Detecting Distance: 25~35mm / 0..98~1.37inWireless Coding Format: Compatible for eV1527Operating Temperature: -10~40Humidity: 90%rhSize: As Picture ShownInstallation and fixing method:The product is glued and not screwed.Package Included:1 x Set of Wireless Door Magnetic Detecting ContactNote:Can not used alone. Should work with the alarm system main unit for alarming..