Description:1.NC means Normally Closed:When the magnet together, the circuit is conductive( light on ); when the magnet separate, the circuit is not conductive ( light off ). When make order,pls check carefully!2.These are the door contact sensors that are in use with any and all commercial or residential card access systems as well as all burglar alarm system.3.Work as an anti-theft alarm, perfect for metal door and window. Specification:Product Name: Magnetic Door SwitchModel: RC-33Contact Type: NC (Normally Closed)Max. Actuation Distance: 10mmMax. Current: 0.5AMax. Contact Power: 10WWorking Voltage: DC100VEach Size(Approx): 17 x 10.6mm / 0.67 x 0.42-inch (H*D)Cable Length(Each): 25cm / 9.
eBay
Tuya WiFi/Zigbee Door Window Sensor Smart Home Wireless Door Detector Door Open / Closed Alarm System work With Tuya Smart Life
Aliexpress UK
DescriptionThe Magnetic Contact Switch is with durable PVC housing for better rust resistance. Designed for use with window and door alarm systems, such as the garage, industrial warehouse, and shops, etc. NC means Normally Closed: When the magnet together, the circuit is conductive( light on ); when the magnet separates, the circuit is not conductive ( light off ). Please check the right need carefully before purchasing it!SpecificationType: Normally Closed (NC)Max. Current: 0.5AMax. Voltage: 100VMax. Power: 10WInstallation Hole Size: 8x4mmInstallation Hole Distance: 15mmMax Sensing Distance: 10mmCable Length: 30cm/ 11.8"Total Size: 29x15.35mm/ 11.42" x 6.04" (L*W)Package Content:1 Pcs x Magnetic Door Switch.
eBay
Electromagnetic Lock Electronic Magnetic Lock DC12V 60KG Mini Electromagnetic Lock Electronic Magnetic Door Lock Power On Lock
Aliexpress UK
Open the door and see if the siren sounds. 1/2/4/10X Alarm Kit (alarm unit & magnetic sensor). Sensor type: alarm. Alarm type: sound. Fix the host to the door / window with double-sided tape. (Battery is not included).
eBay
2Pcs Magnetic Cabinet Catches Door Closer Magnetic Catch For Cabinet Cupboard Wardrobe Closet Drawer Lock Furniture Hardware
Aliexpress UK
Instant smartphone alerts when a door or window opens beyond 1.5 in (3.8 cm). Ensure the gap between sensor and magnet is less than 1.5 in (3.8 cm) when closed. Peel off the mounting tape and stick the sensor onto the door or window body, or fix it with the supplied screws for a more permanent fit.
eBay
Tuya Zigbee Door Sensor Contact Sensor Window Open Closed Detector Smart Home Alarm Security Protection Support Alexa Smart Life
Aliexpress UK
There are two types of reed switches: "normally open" reed switches and "normally closed" reed switches. Normally closed reed switches are closed when not near a magnet; when a magnet is near it, the normally closed switch will open.
eBay
Wireless Door And Window Vibration Sensor Alarm 125dB Glass Breakage Anti-theft Sensor, Easy Install For Home Safety Protection
Aliexpress UK
(4) Open the door and see if the siren sounds. 1or 5or 10Pcs x Set of Alarm Unit(1 Alarm + 1 Sensor). Sensor Type: Sound Alarm. Alarm Unit: 4.5X1.5X1.5CM. (1) Fix the host to the door / window with double-sided tape.
eBay
New Tuya Smart WiFi Window Door Vibration Alarm Sensor 130dB Glass Break Vibration Burglar Sensor Home Safety Alarm Detector
Aliexpress UK
Description:Surface mount contact, screw mount white ABS housing. Wire is not included.Comes with installation screws.Great for use in family and factory wooden window, doors. etc.Switch Type: NC(normal close type), NC : When the magnet together, the circuit is conductive ,When the magnet separate,the circuit not conductive .When make order,please check carefully! .
eBay
IMOU Home Wifi Alarm System Zigbee 3.0 Real Time App Push Motion Sensor Alarm Siren Window Door Sensor IP Camera Work with Alexa
Aliexpress UK
User-Friendly Installation: This magnetic reed switch is designed for quick and for easy installation, allowing you to set it up without any technical expertise, making it perfect for DIY projects. 1 xDoor magnetic switch.
eBay
Door And Window Vibration Sensor Alarm 125dB Glass Breakage, Anti-theft Sensor Easy Install For Home Safety Protection
Aliexpress UK