Sanjie Door Window Alarms - 5 Pack,125dB,Volume Control,Window Door Open Alarm Sensors
Quick take
Sanjie’s 5-pack door and window alarms are simple wireless contact sensors meant to give an immediate audible warning when a door or window opens. They fit buyers who want quick setup and a loud alert for kids, elderly wandering risk, pool safety, or basic entry awareness, but they are not a smart-home system and they only work when the sensor is properly aligned.
Pros and cons
Pros
- Adjustable sound modes, including a 125dB alarm and a 100dB chime option
- Wireless installation with 3M double-sided tape, no wiring or screws required
- Powered by built-in LR44 button batteries for up to about a year of normal use
- Designed as a contact sensor for doors and windows, including sliding doors/windows
Cons
- Not smart-home compatible (it is not an app-based or monitored system)
- Best results depend on mounting gap and alignment, otherwise alerts may be inconsistent
- Recommended for indoor placement, which may limit outdoor use cases
What buyers think
Buyer feedback emphasizes the alarms’ standout loudness. Multiple reviews highlight that the alerts are easy to notice, especially when the goal is to be aware if a window or door is opened unexpectedly. Many buyers also mention installation is straightforward and fast, with the setup feeling simple enough for everyday use. There is also general satisfaction with value, with at least one review pointing out that performance matches what was expected for the price. Review evidence is limited beyond these themes, so expectations around fit (such as how well the unit sits on specific window sizes) should be approached as a possible consideration rather than a guaranteed issue.
How these alarms work
These are contact-style door/window alarms. When the door or window separates from its magnet/contact, the alarm triggers. The sound behavior is designed for immediate attention: once activated, it sounds continuously for about 31 seconds and will not stop until the door or window is closed again.
Sound and modes: what you get
You can choose between three audio modes:
- 125dB alarm (designed to be loud enough to draw attention)
- 100dB alarm
- 100dB chime (“dingdong” two times), useful when you want a softer notification
This makes it easier to match the alarm behavior to the room and situation, for example using chime mode in common areas and using alarm mode near higher-risk entry points.
Installation and placement tips (to avoid false silence)
Setup is meant to be quick: turn the unit on, set the mode, and mount using the included 3M double-sided tape. The alarm is recommended for indoor installation, and performance depends on keeping the sensor and magnet positioned correctly, with the mount keeping the separation within the recommended gap (the listing notes a maximum gap of about 0.4 inches for best performance).
Practical placement ideas:
- Bedrooms and low-profile windows where you want immediate awareness if they open
- Sliding doors where a contact alarm can help detect door access
- Cabinet drawers or other openings if you want extra notification for certain household items (use mounting carefully so the unit stays aligned)
Battery life and what to expect
The alarms use three LR44 button batteries (supplied). Normal battery life is listed as up to about 12 to 13 months. When battery power is low, an indicator light flashes to alert you that it is time to replace the batteries.
Who these are best for
These door and window alarms are a strong fit if you want:
- A simple, local audible alert when a door or window opens
- Tool-free setup using tape rather than drilling
- Extra safety awareness for kids, dementia care routines, or pool safety situations
- A lightweight add-on for apartments, garages, offices, RVs, or seasonal spaces
Who should avoid them
They may not be the right choice if you need:
- Smart-home automation or app/notification features (these are not smart-home compatible)
- Outdoor-grade protection (the product is recommended for indoor placement)
- Consistent performance across poorly aligned mounting surfaces (proper mounting and gap matters)
Pros and cons recap
- Great for: buyers who want loud audible alerts and fast setup for door and window openings.
- Main tradeoff: you get a standalone alarm, not a monitored or smart system.
- Buying caveat: plan placement carefully so the sensor and magnet alignment is correct.
Price and availability
The 5-pack is positioned as a budget-friendly safety add-on, often making it appealing for covering multiple entry points (or multiple rooms) without committing to a full security system.
FAQ
How loud are the Sanjie door and window alarms?
They offer three audio modes, including a 125dB alarm mode and 100dB alarm/chime options.
Are these alarms smart-home compatible or do they connect to an app?
No, they are not smart-home compatible and are designed as standalone audible alarms.
How do you install them?
Installation is wireless and tape-based. Use the included 3M double-sided tape to mount the alarm and magnet/contact components, then turn on the device and select your mode.
Do the alarms stop once they trigger?
When opened, they sound continuously for about 31 seconds and will not stop until the door or window is closed.
How long do the batteries last?
The alarms use supplied LR44 button batteries, with normal battery life listed around 12 to 13 months. A flashing indicator light alerts you when the battery is low.
Are they suitable for sliding doors and windows?
Yes, they are intended to work on sliding doors/windows, with placement and proper alignment helping ensure reliable alerts.
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Specifications
| Product Title | Sanjie Door Window Alarms - 5 Pack,125dB,Volume Control,Window Door Open Alarm Sensors for Kids Safety/Dementia/Pool,Wireless Sensors Keep Your Home Security,Easy to Install,Long Battery Life |
|---|---|
| Category | Electronics > Security & Surveillance > Home Security Systems |
| Brand | SanJie |
| Manufacturer | SanJie |
| Model Number | YYDOA01 |
| Color | silver |
| Power Source | Battery Powered |
| Compatible Devices | Home Security System |
| Battery Description | Alkaline |
| Number of Batteries | 1 12V batteries required. (included) |
| Voltage | 110 Volts |
| Control Method | App, Touch |
| Audible Noise | 110 Decibels |
| Mounting Type | DOOR/WINDOW MOUNT |
| Maximum Range | 300 Meters |
| Sensor Technology | Contact Sensor |
| Smart Home Compatibility | Not Smart Home Compatible |
| Shape | Oval |
| UPC | 680727535469 |
| Manufacturer Warranty Description | lifelong |
| Mfr Part Number | YYDOA01 |
| Unit Count | 5.0 Count |
| Item Type Name | Door Alarm |
| Built-In Media | Magnets |
Available variants
Color
- White
- silver
Number Of Items
- 5
- 3
- 10
- 8
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