--- product_id: 10741811 title: "Universal Security Instruments MDS300-401 4-in-1 Universal Smoke Sensing (IoPhic) Smoke and Fire Alarm with CO and Natural Gas Alarm" brand: "universal security instruments" price: "£2.76" currency: GBP in_stock: false reviews_count: 5 category: "Hi" url: https://www.desertcart.co.uk/products/10741811-universal-security-instruments-mds300-401-4-in-1-universal-smoke store_origin: GB region: United Kingdom --- # Universal Security Instruments MDS300-401 4-in-1 Universal Smoke Sensing (IoPhic) Smoke and Fire Alarm with CO and Natural Gas Alarm **Brand:** universal security instruments **Price:** £2.76 **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** Universal Security Instruments MDS300-401 4-in-1 Universal Smoke Sensing (IoPhic) Smoke and Fire Alarm with CO and Natural Gas Alarm by universal security instruments - **How much does it cost?** £2.76 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/10741811-universal-security-instruments-mds300-401-4-in-1-universal-smoke) ## Best For - universal security instruments enthusiasts ## Why This Product - Trusted universal security instruments brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Product Description The Universal Security Instruments MDS300-401 4-in-1 Universal Smoke Sensing Alarm provides quadruple the protection with only two installations. This set comes with (1) MDS300 IoPhic Smoke and Fire Alarm and (1) MCND401 Plug-In Carbon Monoxide and Natural Gas Smart Alarm to protect your family against four deadly household threats: fast-flaming fires, slow-smoldering fires, carbon monoxide and natural gas/methane. Perfect for new or replacement installations, both alarms are suitable for houses, apartments and mobile homes. Universal Smoke Sensing Technology (IoPhic) responds 87% faster to slow-smoldering fires and quickest to fast-flaming fires. Additional features include a self-diagnostics check, sensitivity adjustment for changes in temperature or humidity, and an end-of-service life warning that sounds when it's time to replace the battery. The MCND401 features a compact plug-in design, covering only (1) outlet for fast and easy installation requiring no wiring. A digital display screen provides carbon monoxide parts- per-million levels, displays "GAS" during an occurrence. Peak CO levels are recorded with the memory button and (3) LED colors display alarm status: power, CO and gas. Both alarms come with a 9-Volt alkaline battery that operates the alarm and continues protection during a power outage. WARRANTIES: MDS300-401: 10-year limited warranty MCND401: 5-year limited warranty. From the Manufacturer Founded in 1969, Universal Security Instruments has over 50 years of heritage in providing home safety products for families. With state-of-the-art manufacturing facilities, Universal Security Instruments continues to launch revolutionary new products and innovative technologies with the mission of always working to keep families protected. ## Features - Universal Smoke Sensing Technology responds quickly to both fast-flaming and slow-smoldering fires - 9-Volt alkaline battery (included) operates the alarm and continues protection in the event of a power outage - Responds 87-percent faster to slow smoldering fires and responds quickest to fast flaming fires - Features a quick activation pull-tab and front-loading battery drawer for replacement without removing the alarm - Comes with a 10 year limited warranty - ›See more product details ## Images ![Universal Security Instruments MDS300-401 4-in-1 Universal Smoke Sensing (IoPhic) Smoke and Fire Alarm with CO and Natural Gas Alarm - Image 1](https://images-na.ssl-images-amazon.com/images/I/61Qnf5Yv0OL.jpg) ## Customer Reviews ### ⭐ Does Not Work *by C***S on Reviewed in the United States on August 19, 2013* I'm downgrading this from 5 star to 1 star. I will give it Zero star if possible. The Natural Gas alarm have no use. It works when I press the test button so it gives me peace of mind. Well I got home today and the whole house smells gas because my Mother in law this time operated the gas range the wrong way. She was not able to make the fire light up and at the same time did not close the the switch completely. I asked her what time she used the range, she said around 12:pm. Well we got home at 4:20pm and the house smells gas up to the second floor. The plug in alarm is right next to the range and did not even alarm to give warning to my Mother-In-Law that the gas was not shut off properly.I again tested the alarm by letting the gas from the range an put it right next to the gas source. The alarm did not even work after 5 minutes of test. I tried to change the position of the alarm by putting it face down to the gas source and this time it did work. Well this is a plug-in type which is installed on the wall. The design of this will never work as it only work when you have it face down to the source.-------------------------------I bought this combo item after coming home to the smell of natural gas in my home that my Mom did not detect. The product is easy enough to install. I was able to plug in the natural gas/carbon monoxide detector right close to where the stove is. I also installed the smoke detector right on our kitchen ceiling which I cannot do before because the cheaper smoke/fire alarm would always go off. The Natural Gas/Carbon monoxide have not trip off so far but it does work when I press the test button so I would assume and hope that it is working properly. The smoke alarm have sounded 2x since I installed the product about 2 or 3 months ago. Both happened when the water from the food being boiled have dried up. The smoke alarm alerted us quickly preventing the food to and the casserole to completely go to waste. ### ⭐⭐⭐⭐⭐ Smoke alarm *by K***N on Reviewed in the United States on January 21, 2014* Great replacement, beats the old system, 19 80's version, hands down. Having the gas detector was an additional bonus! Great product at a great price!! ### ⭐⭐⭐⭐⭐ High Quality, Economical and Vital *by D***. on Reviewed in the United States on August 24, 2013* Combo alarm for fire, smoke, carbon monoxide and natural gas. Portable and vital safety items for anyone, especially someone without a sense of smell (re: smoke and natural gas). Necessity for college housing - on and especially off campus. --- ## 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.co.uk/products/10741811-universal-security-instruments-mds300-401-4-in-1-universal-smoke](https://www.desertcart.co.uk/products/10741811-universal-security-instruments-mds300-401-4-in-1-universal-smoke) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-22*