--- product_id: 69929903 title: "Ring Alarm Contact Sensor 2-pack (1st Gen)" brand: "ring" price: "HK$3" currency: HKD in_stock: false reviews_count: 11 url: https://www.desertcart.hk/products/69929903-ring-alarm-contact-sensor-2-pack-1st-gen store_origin: HK region: Hong Kong --- # Mobile compatibility Instant alerts Tool-free setup Ring Alarm Contact Sensor 2-pack (1st Gen) **Brand:** ring **Price:** HK$3 **Availability:** ❌ Out of Stock ## Summary > πŸ”’ Secure your space, elevate your peace of mind! ## Quick Answers - **What is this?** Ring Alarm Contact Sensor 2-pack (1st Gen) by ring - **How much does it cost?** HK$3 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/69929903-ring-alarm-contact-sensor-2-pack-1st-gen) ## Best For - ring enthusiasts ## Why This Product - Trusted ring brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Long-Lasting Power:** Includes a 3V lithium battery for reliable performance. - β€’ **Future-Proof Your Home:** Compatible with Ring Alarm Gen 2 products for enhanced security. - β€’ **Stay Alert, Stay Secure:** Receive instant mobile notifications when doors or windows open. - β€’ **Universal Compatibility:** Works seamlessly with both iOS and Android devices. - β€’ **Hassle-Free Installation:** No tools requiredβ€”mounts easily to any door or window frame. ## Overview The Ring Alarm Contact Sensor 2-pack (1st Gen) offers a smart solution for home security, providing instant alerts to your mobile device when doors or windows are opened. With easy installation and compatibility with various devices, this sensor is designed to enhance your home security effortlessly. ## Description Full description not available ## Features - Requires the Ring alarm base station - Get instant mobile alerts when doors or windows open in your home - Compatible with any iOS or Android device - Easy installation with no tools required - Mounts to door and window frames - 3V lithium battery included - Compatible with Ring Alarm Gen 2 products ## Images ![Ring Alarm Contact Sensor 2-pack (1st Gen) - Image 1](https://m.media-amazon.com/images/I/71xszCJja+L.jpg) ![Ring Alarm Contact Sensor 2-pack (1st Gen) - Image 2](https://m.media-amazon.com/images/I/81Pe70+ORUL.jpg) ![Ring Alarm Contact Sensor 2-pack (1st Gen) - Image 3](https://m.media-amazon.com/images/I/81YpLILTT5L.jpg) ## Available Options This product comes in different **Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars UPDATE - I DO NOT RECOMMEND *by R***5 on Reviewed in the United States on December 8, 2019* Update 5/27/2020I have now had my ring alarm for quite some time, I also own a ring pro doorbell camera. I can no longer recommend the ring alarm system. Anything that is designed to protect you, should be reliable and effective, the ring alarm is neither! I was given a motion sensor that was dead on arrival, which I now consider a bad omen! I just had a contact sensor slowly fail, and then eventually die. Well.. the light flashes when opening the device, but after removing it from my ring devices on the app, it will no longer even reconnect. These contact sensors are bulky, difficult to use with windows, and take expensive lithium batteries. I had to replace one of the batteries within 1 month of owning the ring alarm, and have had to replace the others probably multiple times, more often than seems necessary.The bottom line is that this system has many flaws that need to be worked out, which Ring must know as they now have gen 2 models of components. People buy alarms to keep their family and their property safe, an unreliable alarm jeopardizes that goal!----------------------------------------------------------Original review:The contact sensors work well and are very simple to install. I have 4 of these sensors and have never had a problem with them. In the ring app you can setup the sensor to chime when the door/window is open, and send an alert to your phone.The only negative is that these sensors seem to be much bigger than necessary. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Works great and easy to install *by W***O on Reviewed in the United States on December 12, 2019* These have been great so far. Any break in the connection between the 2 parts of the sensor is is quick to report in the app.Some have commented that the sensors are too big for double hung windows. The issue being that, for double hung windows, the bottom part slides up and the top part of the window slides down - meaning you would need 2 sensors to cover the entire window. You could feasible cover both the top and bottom panes by mounting the sensor in the middle - one on the lower pane and the other on the upper pane - so that movement of either would trip the sensor. However, the complaint is that the sensor is too large to do that. Not to worry, the smaller half of the sensor is just a magnet surrounded by plastic. You can easily open the plastic, remove the much smaller magnet and mount it with double sided tape. Then it's small enough to work for double hung windows. ### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars Great product, sound mind. *by T***N on Reviewed in the United States on February 6, 2020* These are pretty easy to install. I used the 3M adhesive that came with mine and they've held up. Only wish they came with something to use as a riser. We have crown moulding and that caused the magnet to not line up with the sensor, found some things around the house that worked in a pinch but if anyone from Ring is reading this- include something to help raise the magnet!Also, bare in mind that the Alexa support is great. I set a routine to alert me when the doors are opened in addition to the 'chirp' that comes from my Ring Base- and I set my routines up individually to alert me to which door is open. It is immediate too, no lag or anything. Great for peace of mind. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hk/products/69929903-ring-alarm-contact-sensor-2-pack-1st-gen](https://www.desertcart.hk/products/69929903-ring-alarm-contact-sensor-2-pack-1st-gen) --- *Product available on Desertcart Hong Kong* *Store origin: HK* *Last updated: 2026-05-17*