【Function】 This is a set of magnetic detection switches used to protect mostly doors and windows 【Protective device】 This magnetic sensor detector is a Protective device monitors the opening and closing of doors and windows 【Long lasting】 High quality magnetic sensor contacts with strong magnetic response, sensitive and long durability 【Easy to install】 The wired part is often installed on the fixed door frame, and the coupling part is mounted in the corresponding place on the door 【Application】 This set of magnetic sensor detector includes wired part and mating part, which is ideal for installation on home, garage, warehouse, business and store doors, etc. Specifications: Condition: 100% brand new Material: zinc alloy Color: as picture shown Rated voltage: 12V Nominal current: 120mA Detection distance: 50 ~ 70mm / 1.9 ~ 2.7inch Package Included: 1 * Set of Magnetic Sensing Contacts Note: / p Cannot be used alone. Should work with the main unit of the alarm system for alarm. Note: this does not include other things, the color is based on the first picture, and other pictures only show as the effect Due to the differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!