KNOBWELL WiFi Door Sensor, Smart Window Door Sensor Alarm, Door Open Detector with Alert Notification Compatible with Alexa, Entry Detector Sensor for Home Security and Home Automation

Price: $16.95
(as of Oct 06, 2025 12:47:59 UTC – Details)


Specification::
Material: ABS Plastic
Color: Grey
Wireless type: Only Support 2.4 GHz WIFI (5G is not supported!）
Stand-by Current: <5uA
Induction Range:<22m
Voltage: 3V
Battery Life: 2 years(10 times a day)
Main Body’s Size: 41mm*27mm*11.5mm
Deputy Body’s Size: 41mm*10mm*11.5mm

Package list::
1 * Wifi Door and Window Sensor Main Body
1 * Door Sensor Deputy Body
1 * Instruction Manual
1 * Adhesive Sticker

Lights Status::
Pairing——Fast flickering
Sensor close/open——Flicker once
Close/open on low power——Flicker 3 times
Reset to default setting——Light up for 1 seconds

【Real-time Alert On Your Phone】KNOBWELL door and window alarm sensor is designed to monitor the open or close status of any entrance; An alert notification will automatic send to your smartphone once the sensor triggered. The smart door lock will automatically lock when the WiFi door sensor senses the door is closed.
【Multi-Scenes Application】You can install the door sensor on front doors, windows, garage doors, liquor cabinets, safety deposit box, pet doors and more. The contact sensor is also a good option as a mailbox sensor.
【Low Battery Warning】This door security alarm sensor with low power consumption offers a battery life of more than 2 years. Super-long battery life avoid replacement frequently. When the battery is running out, you will receive an App notification.
【Easy Installation】No Need to use complicated tools when installation, the door open alarm comes with 3M sticker, which is easy to install. The installation distance between the magnet of the alarm system and the host should not exceed 22mm. Please read the manual carefully before use.
【Reliable Service & Warranty】Our products are backed by a 30-day money-back guarantee, 1-year product warranty and lifetime customer support from the date of purchase. If you have any problems, please feel free to contact us at any time.