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SanJie Door Alarm, Instant Alert, 30s-4min Delay for Freezer Door Left Open
✅ In stock
F
Grade
⚠️ Price may have changed. Last updated 24+ hours ago — confirm on Amazon.
Check Deal at Amazon
Price verified Sep 23, 2026 6:39 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
0/22
Market Standing
0/20
Deal Strength
0/20
Momentum
0/10
📝 Product Overview
🏪 Sold by
SanJie Direct
📦 Fulfillment
Fulfilled by Amazon
🚚 Shipping
Free Shipping
Product Details
✓【Door Alarms When Opened】Install this door alarm sensor on your door and set it to instant alarm mode. When you're relaxing or busy with household cleaning, you'll be instantly alerted if your kids open the bedroom door or an elderly family member with dementia tries to leave home through the front door. It helps you stay aware of your family's movements and respond quickly.
✓【Fridge & Freezer Door Left Open Alarm】If a fridge or freezer door is left open, the delayed alert reminds you to close it after the selected time, reducing prolonged cold-air loss and the risk of food spoilage and unnecessary energy waste. Normal short openings stay quiet.
✓【Loud Door & Window Safety Alert】If a door or window is opened unexpectedly at night, the up to 125dB siren helps you notice it quickly. It adds an extra layer of awareness around doors and windows without the need for a complicated security system.
✓【5 Alert Modes】Mode 1 alerts instantly when the door opens. Modes 2–5 alert after 30 sec, 1 min, 2 min, or 4 min if the door stays open. Once triggered, the alarm sounds for 10 sec, pauses for 10 sec, and repeats until the door is closed or any button is pressed.
✓【2 Tones & 5 Volume Levels】Choose between an alarm siren and a “di-di-di” chime, with 5 volume levels from mute to 125dB. Turn it up when you need to hear the alert from another room, or lower it for quieter spaces.
✓【Tool-Free, Renter-Friendly Installation】Use the included 3M adhesive to mount the alarm and sensor with no wiring or drilling. Keep both parts properly aligned, then turn it on and select your preferred mode. Easy to install on glass doors, sliding doors, patio doors, windows, cabinet doors, and other suitable indoor doors.
✓【After-Sales Service】Video tutorials are available in the user manual and on the product page to help you get started. If you have any questions or run into any issues while using the product, please contact us through the order channel, and we will assist you as soon as possible
⚙️ Specifications
Color
Black 3
Brand
SanJie
Power Source
Battery Powered
Product Dimensions
4.57"L x 2.52"W x 1.3"H
Number of Batteries
3 AAA batteries required. (included)
Audible Noise
125 db
Mounting Type
Door Mount, Window Mount
Sensor Technology
Contact Sensor
Item Dimensions L x W x H
4.57"L x 2.52"W x 1.3"H
Item Highlight
Kids Open Doors—Instant Alert; Fridge Door Left Open—Delayed Reminder To Close It And Avoid Food Spoilage; 2 Tones, 0-125dB
Item Weight
0.26 kg
