--- product_id: 122619775 title: "Sanjie Door Alarms When Opened,Door Window Alarm Sensors for Kids Safety/Home Security/Pool/Garage/Dementia/Toddler/Travel Security,Easy to Install,Volume Control/Loud Alert,Long Battery Life,10 Pack" brand: "sanjie" price: "VT20825" currency: VUV in_stock: true reviews_count: 8 url: https://www.desertcart.vu/products/122619775-sanjie-door-alarms-when-opened-door-window-alarm-sensors-kids store_origin: VU region: Vanuatu --- # Up to 125dB loud alarm 12-month battery life Easy 3M tape installation Sanjie Door Alarms When Opened,Door Window Alarm Sensors for Kids Safety/Home Security/Pool/Garage/Dementia/Toddler/Travel Security,Easy to Install,Volume Control/Loud Alert,Long Battery Life,10 Pack **Brand:** sanjie **Price:** VT20825 **Availability:** ✅ In Stock ## Summary > 🚪🔔 Stay one step ahead with Sanjie’s smart, loud, and lasting door alarms! ## Quick Answers - **What is this?** Sanjie Door Alarms When Opened,Door Window Alarm Sensors for Kids Safety/Home Security/Pool/Garage/Dementia/Toddler/Travel Security,Easy to Install,Volume Control/Loud Alert,Long Battery Life,10 Pack by sanjie - **How much does it cost?** VT20825 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/122619775-sanjie-door-alarms-when-opened-door-window-alarm-sensors-kids) ## Best For - sanjie enthusiasts ## Why This Product - Trusted sanjie brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Effortless Setup:** Peel, stick, and activate in seconds—no tools required - • **Versatile Safety Use:** Perfect for doors, windows, cabinets, and more—indoors or on the go - • **Instant Security Alert:** 125dB alarm ensures you never miss a breach - • **Customizable Volume Modes:** Choose from loud alarm or gentle chime to suit your environment - • **Reliable Long-Lasting Power:** Up to 12 months of continuous protection with battery low indicator ## Overview Sanjie Door Alarms provide a powerful 125dB alert triggered by magnetic sensors when doors or windows open. Designed for versatile use—from home security to child and elder safety—these alarms install easily with 3M adhesive tape and offer three volume modes including a chime. Powered by included batteries, each unit lasts up to 12 months and features a low battery indicator. Sold in convenient 10-packs with lifetime after-sales support, they deliver peace of mind for busy professionals seeking reliable, hassle-free security. ## Description Full description not available ## Features - Peace of Mind - Door window alarms guard you and your home's security. Alarms can also keep the safety of kids as well as the elderly who need care - Wide Use - Magnetic sensor will alarm or chime if separated.Can be used in pool, home, apartment, store, office, garage, RV, warehouse, hotel and more. Alarm sensor can be installed on sliding door/window, cabinet, drawer, etc - Easy to Install - Tear off the 3M double-sided tape on the back of the wireless alarm and install it on the door or window, etc. Turn on the switch, set the mode and ready to use. It is recommended that the alarm be installed indoors - Volume Control - Alarms have 3 modes:125dB Alarm(loud enough), 100dB Alarm, 100dB Chime (dingdong 2 times). When the door window sensor is opened,it will alarm continuously for 30 seconds and will not stop until the window or door is closed - Long Battery Life - Powered by 3 LR44 button batteries supplied. Normal life of the alarm is up to 12 months. When the alarm is in low battery, the indicator light will flash to alert you - After - sales Protection - All customers who have purchased our window door alarms sensors can enjoy the right to lifetime after-sales protection.If you encounter problems in the use of the process,please contact us immediately.We will reply to you within 24 hours to help you solve the problem ## Technical Specifications | Specification | Value | |---------------|-------| | Number of Batteries | 2 12V batteries required. (included) | | Voltage | 3 Volts | | Control Method | App, Touch | | Noise Level | 110 dB | | Mounting Type | DOOR/WINDOW MOUNT | | Maximum Range | 3E+2 Meters | | Sensor Technology | Contact Sensor | | UPC | 682228238283 | | Manufacturer | SanJie | | Part Number | YYDOA01 | | Item Weight | 13 ounces | | Product Dimensions | 3 x 1.5 x 0.8 inches | | Country of Origin | China | | Item model number | YYDOA01 | | Batteries | 2 12V batteries required. (included) | | Is Discontinued By Manufacturer | No | | Style | 10 PACKS | | Material | plastic | | Shape | Oval | | Installation Method | Self-Adhesive | | Item Package Quantity | 1 | | Included Components | Magnets | | Batteries Included? | Yes | | Batteries Required? | Yes | | Battery Cell Type | Alkaline | | Description Pile | Alkaline | | Average Battery Life | 3 years | | Warranty Description | lifelong | ## Product Details - **Color:** White - **Brand:** SanJie - **Power Source:** Battery Powered - **Compatible Devices:** Home Security System - **Battery Description:** Alkaline ## Images ![Sanjie Door Alarms When Opened,Door Window Alarm Sensors for Kids Safety/Home Security/Pool/Garage/Dementia/Toddler/Travel Security,Easy to Install,Volume Control/Loud Alert,Long Battery Life,10 Pack - Image 1](https://m.media-amazon.com/images/I/71d4g34FjZL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Are the alarms easy to install?** A: YES. Just remove the 3M double-sided tape and ensure the gap between the alarm does not exceed 0.4in.The arrows of the alarm are aligned with each other. **Q: How long do the batteries typically last?** A: The batteries are already built into the alarm. 1 Alarm Pack for 3*LR44 batteries and will last 12 months normally. **Q: Can the volume of the alarm be adjusted?** A: YES. The alarm has 3 modes, Mode 1: 125dB alarm, Mode 2: 100dB alarm, Mode 3: 100dB “ding dong” 2 times. The alarm maximum sound loud enough to deter intruders. **Q: Are the alarms suitable for use on sliding doors or windows?** A: YES. Alarms are generally available for sliding doors/windows. For best performance, make sure the alarm is mounted in a position that detects movement. **Q: Does alarm false alarm easily?** A: NO. Alarm sounds immediately upon separation and lasts for 30s before stopping unless the door/window is closed. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excelente *by Y***E on February 17, 2025* Excelente suena duro ### ⭐⭐⭐⭐⭐ Great, but be careful *by N***L on July 9, 2022* It works as intended, however I have to warn people not to install this around kids/babies/toddlers/pets and if you can wear ear plugs because it’s been four hours and my ear won’t stop ringing since i briefly heard the alarm. It’s very frustrating and is showing no signs of stopping.There is no doubt I can hear it from my window well in my basement to my third story even with a fan. It sounds very legit and if I didn’t know better I would assume it was hooked up to a professional security system. I believe my neighbors would hear it in their own house, it’s that loud.This would be great for people with curious toddlers or kids who you fear might sneak out the door. You can set it high and they can’t reach it, the sticky tape is very impressive and strong.It works, gives me peace of mind. ### ⭐⭐⭐⭐ Works well for the price *by S***M on May 23, 2025* This product does exactly as advertised. They are easy to install and VERY loud. I've only had for about a week but so far they seem to be functioning well. I have these only my doors and windows. They work perfectly for the door but I do wish they were just a little bit narrower to fit in the window better. Overall they work great especially for the price. ## Frequently Bought Together - Sanjie Door Alarms When Opened,Door/Window Alarm Sensors for Kids Safety/Home Security/Pool/Garage/Dementia/Toddler/Travel Security,Easy to Install,Volume Control/Loud Alert,Long Battery Life,10 Pack - LiCB 20 Pack LR44 AG13 357 303 SR44 Battery 1.5V Button Coin Cell Batteries --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/122619775-sanjie-door-alarms-when-opened-door-window-alarm-sensors-kids](https://www.desertcart.vu/products/122619775-sanjie-door-alarms-when-opened-door-window-alarm-sensors-kids) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-09*