5pcs Normally Closed Recessed Door Magnetic Reed Alarm Contact Sensor

Features-Size: 2.3x1.9x1cm/0.9x0.75x0.39in-Color: Black-Material: Plastic + magnetic items- contacts, very practical and useful reed .-Product Info:Door and window contact sensor- Easy to install, easy to use door opening alarm.-Note: Normally closed signal (conducting when merging, disconnecting when opening the door, connecting the alarm host.) door alarms- Designed for use with alarm systems magnetic safety door closing system.- Magnetic operated by an applied magnetic field magnetic alarm .- Circuit is connected when magnet is closed magnetic door alarm.Package Include5 x alarmsGoods Descriptionmagnetic door closing system Easy to install and use.door security devices It is designed for use with alarm systems, great for use in family and factory window, door.personal alarm etc.door and window sensors NOTE：This product is not suitable for .intelligent door magnetic alarm This item are 5pcs plastic reed which are operated by an applied magnetic field

• Door alarms when opened--the door magnet should be from the strong magnetic field interference source such as a ​,embedded magnets
• Door opening alarm--fits your needs and alert you of your home security,magnetic door alarm
• Electrical contacts for doors--circuit is connected when magnet is closed,security door magnet
• Window alarm --made of high-quality plastic and magnetic material, durable to use,door and window sensors
• Security and anti-theft door blocker--these door magnetic alarm are useful, practical, easy to install,electrical equipment