SMART WIFI DOOR CONTACT DETECTOR

How the sensor works
This smart door contact detector is built in two pieces: a main part that holds the electronics, the battery and the reset button, and a slim magnet part. Mounted side by side on the door and the frame, they read each other magnetically. Separate them and the device sends the status change over your Wi-Fi network to the compatible smart home app, which shows a live open or closed state plus a log of recent openings. Because the detector talks straight to your router, there is no hub, no gateway and no low-voltage wiring to pull, which makes it a favourite for finished basements, rented spaces and retrofits where fishing cable is simply not an option.

Technical specifications
Model: LCDO-WIFIDOORSENSOR-WH (DOORWFW1)
Battery: 1X CR2-3V
Standby current: 13 uA
Working current: 115-120 mA
Wireless type: 2.4 GHz
Wireless standard: IEEE 802.11 b/g/n
Wireless encryption: WEP / WPA / WPA2
Wireless range: 45 M
Main part: 71 x 21 x 22 mm (2.75 in)
Magnet part: 40 x 11 x 11 mm (1.5 in)
Operating temperature: 0°C ~ 40°C (32°F ~ 104°F)
Use: indoor only
Warranty: 1 year against manufacturing defects
Certification: complies with Part 15 of the FCC Rules

Setup and installation
Before you pair, make sure you have an Internet connection with a Wi-Fi network, a strong Wi-Fi signal, a password-protected network (letters and numbers only, and not too long) and a router with enough free connections. Confirm the device is powered on, keep the sensor, your smartphone and the router as close together as possible, then open the app, tap the "+" icon at the top right of the Devices page and choose the device type. In EZ mode the LED indicator light flashes quickly; if pairing gives you trouble, press the reset button again to switch to AP mode, where the LED flashes slowly. When the LED lights up for 4 seconds then goes off after 2 seconds, the device is in configuration mode. Physically, the kit includes a sticker, a screw and a screw anchor, so you can use the adhesive on a clean, dry surface or screw the halves down for good. Keep both parts closely aligned with a minimal gap and test the signal from your chosen spot before pressing everything down permanently.

Automations, app and voice control
The free companion app runs on mobile devices with iOS 8.0 and above and Android 4.0 and above. Beyond simple alerts, the settings let you customize scenes and share the device so family members, roommates or staff can see the same status. That is where a contact sensor really earns its keep: opening a linked door can switch on a hallway fixture, wake up an LED strip under a stair rail, power a plug-in lamp, or trigger a push notification only at night. Many setups also work with popular voice assistants, so you can simply ask whether the garage or patio door was left open before heading to bed.

Where it shines and what pairs with it
Use it on front and back entries, garage service doors, basement windows, medicine or liquor cabinets, gun safes, stockrooms, server closets and retail display cases. In Canadian homes it is handy on the door between the garage and the house in winter, when an unnoticed gap means cold air all night. Since it is rated for indoor, dry locations between 0°C and 40°C, mount it inside the heated envelope rather than in an unheated shed. Build out the same ecosystem with the Intelligent Wi-Fi motion detector, which shares the same app and lets you combine door openings and movement in one scene. The full technical PDF spec sheet is available in the Documentation tab for pairing steps, LED indicator states and complete specifications.