TECKNET Door Alarm Sensor, Mini Window Alarm Sensors, Door Sensor Alarm for Home Security Systems with Quick Loud 100dB Ring Alarm, Wireless Burglar Alarms for House, Shop, Office, Garage (9 PCS)
Original price was: £23.99.£20.39Current price is: £20.39.






Price: £23.99 - £20.39
(as of Jun 05, 2025 22:32:12 UTC – Details)
Product Description



Effective deterrent
The 100dB burglar alarm effectively deters intruders.
Child safety alarm
Triggers an alarm when children open doors or windows on their own.
Pool Alarm
To prevent unauthorized access to the pool during closing time.
Pet Monitoring Alarm
Alerts you with an open alarm and keeps you updated on the whereabouts of your pets.
Customer-friendly
The store alarm ensures you never miss a customer.
Increased security
The office alarm system ensures timely detection of entrances for improved security.

【Quick Alarm & 3 Modes】 The “Alarm” mode will immediately activate a continuous and super strong 100 dB siren when the sensor and the alarm are separated by more than 0.78 inches (20mm) until they are back together. In “Chime” mode, the door alarm will emit a brief audible alarm, serving as a gentle reminder. If you prefer silence, simply switch to the “Off” mode.
【Multifunctional】 The door alarms for your home can also be used as window alarms, pool alarms, shed alarms, garage alarms, or sliding door alarms. TECKNET door sensors are the perfect solution for apartments, mobile homes, offices, hotels, stores, and more.
【Easy to Install】Just use the attached stickers to gently install the burglar alarm on various parts of the house, such as doors, windows, cabinets, drawers, gates, etc.! (Note: Keep the installation area clean and ensure that the sensor is installed within 0.5 inches from the arrow side of the alarm.)
【Mini and Portable】 With its mini design, this wireless ring alarm won’t take up any extra space. You can easily carry it in any backpack when you go out. (If the alarm isn’t working, check if it’s in OFF mode or if the batteries need replacing.)
【36-MONTH Warranty】If you encounter any problems in using the product, please feel free to contact our professional customer service team, enjoying TECKNET 36-Month Warranty (Registered Only)
Customers say
Customers find the door alarm sensor easy to install, with one mentioning it’s simple to add to windows or doors. Moreover, the product receives positive feedback for its functionality, quality, and value for money. Additionally, customers appreciate its loud volume control, strong magnet strength, and good fit.
13 reviews for TECKNET Door Alarm Sensor, Mini Window Alarm Sensors, Door Sensor Alarm for Home Security Systems with Quick Loud 100dB Ring Alarm, Wireless Burglar Alarms for House, Shop, Office, Garage (9 PCS)
Add a review
Original price was: £23.99.£20.39Current price is: £20.39.
Charlie.S –
Good choice!
Great product all round. Price, quality and use makes this a good choice. Works well, itâs loud and fits the needs for its use.
gary –
Door/window alarms
These are so easy to add to a window or door and you can choose the chime or the alarm sound,, also theirs a volume control on them aswell,, they come with everything you need to do the installation well worth the money 5stars
GoksinB –
Easy to use
Very effective with different sound levels and types. Easy to install with clear instructions.
sadarse –
No Ding Dong
Work well fitted three within 10 minutes only gripe is the chime is not a Ding Dong but more like a cat getting his throat cut
Molly –
Very good
Have a son with autism.Likes to walk around the house at 4 in the morning, worst thing is going into the bathroom and turning the taps on.Tried everything baby proof items nothing worked.So got one for the bathroom and one for the bedroom making different sounds.This helps me as will alert me when his awake to get him back to bed as well as warm me his going in the bathroom.Product works well
chrissie gee –
Additional peace of mind.
Replacement batteries are quite expensive if you have to replace multiples at the same time, but if your house alarm is off when you are in during the day, these little gadgets are brilliant at providing peace of mind. Loud siren when on that setting, audible all over the house and even in the garden. I keep the ‘pulse’ setting on my front porch door during the day as so few delivery drivers bother to knock, post covid, just leaving parcels visible in the porch, and it alerts me to the fact there has been a delivery. With the self adhesive pads they are quick and easy to fit wherever you need them. For battery replacement the ‘unit’ slides out of the housing and slides back in simply with no fuss.
Tom-P –
Spook In Stereo
These TECKNET (3 pack of) Alarm Sensors are alright & in certain situations would certainly deter or slow down a filthy thief I guess it depends on how qualified a thief they are?If they’ve got a couple of screwdrivers, pliers or a small crowbar they’re not new to theft so they’ll know to just rip one of these off or to simply turn it off as it’s not loud enough to wake the neighbours really & that’s say on a row of council owned terraced houses & the thief would’ve known that the house, flat whatever was empty as they’re extremely good at being extremely bad these scumbags. (plus I don’t believe that these are 100db loud anyway ?!?!).I got one for the gentle ring of the backdoor being opened & closed, they’re very easy to set up, you just pull out the battery tab find a position for them to go & apply the adhesive strip on to the alarm & apply to your chosen area for the alarm whilst applying firm & even pressure for a few minutes (say 5) so it’ll hold well (the same with the smaller part of the alarm).Now I had two spare so I put one on a door upstairs & then decided to put the third from the pack very closely next to the second one making it ~Stereo~ with the two going off together from two different sources, it’s louder it’d take just that little longer to disarm them & it weren’t a waste of an alarm!Try it, place two close together like in the photo that I’ve provided or on separate sides of the door, window that you’re securing, you’ll hear that it’s louder & would be more shocking to a burglar if there were alarms sounding from different sources/areas in sync again making them louder & taking longer to disarm that’s if the thief/thieves haven’t scarped already as it will be confusing & when you’re confused with fear you’re natural response is to remove yourself from the situation (especially if you bring the long arm of the law into the mix!).
Amazon Customer –
Peace of mind and a full night sleep
I always got very scared when my parents would go away and I was left alone in the house. I bought the 3 pack of these alarms on the off chance it would make me feel more secure and it without a doubt did the job perfectly. I know they wouldn’t stop someone for entering but the loudness of them will sure give you the time to call 999 and either hide or find something to protect yourself. I couldn’t rave about these anymore. Well worth the small price tag they come with!
The Spectator –
Funktionieren so wie vorgesehen. Die Einstellung der Lautstärke ist ein sinnvolles extra Feature. Wichtig anzumerken, wäre aber, dass bei Türen, die einen Versatz zwischen Tür und Türrahmen haben so wie das oft der Fall ist, der Abstand zu groà ist. Ich habe zusätzliche Klebepads von 3M unter den Magneten geklebt um den Abstand auf unter 2 cm zu verkleinern. Sonst funktioniert alles einwandfrei und das Produkt macht auch allgemein einen gut verarbeiteten Eindruck.
MarÃa Florit de Martà –
Sin la necesidad de hacer una instalación eléctrica, y después de 10 meses colocado en el exterior, está siendo muy útil. Está protegido desde el primer dÃa de las inclemencias del tiempo, con una cubierta para timbres comprada también en Amazon. Le he dado un margen de espacio para poder acceder a él con la mano, desprenderlo del adhesivo y poder cambiarle la pila, aunque la original aún sigue funcionando.Tiene control del nivel de sonido e incorpora distintas músicas para poder escoger.La gran ventaja es que el receptor lo puedo conectar en algún enchufe del jardÃn cuando lo creo necesario. Francamente !! lo volverÃa a comprar¡¡26/02/2023 La pila de origen me ha durado 2 anos. Cómo está protegido con una cubierta especial para timbres, que como ya dije, también la compré en Amazon.El timbre exterior sigue trabajando perfectamente.
M. Heuninck –
Je cherchais un système de sonnette à distance pour placer à côté d’un lit d’un malade. Le bouton d’appel est très grand et de plus, rétro-éclairé; exactement ce qu’il fallait pour être visible également de nuit. Il suffit de placer le bloc “carillon” dans une prise de courant dans la pièce où le garde-malade réside, et le tour est joué ! Possibilité d’augmenter ou diminuer très facilement la puissance du carillon et même de choisir une mélodie !Excellent appareil “plug and play” avec un design super. Franchement très bien pour son prix !
Cliente Amazon –
Vienen muy bien envueltos, funcionan a la perfección, tiene 2 reguladores, uno de intensidad del sonido y otro para elegir el tipo de sonido (alarma, aviso o apagado).Viene con cinta de doble cara para pegarlo. En marco de ventana o puerta blanco, se disimula bastante bien y no queda feo ni destaca.
claudy 27 –
Bonjour , ces petites alarmes s’appliquent trè facilement . le son ( règlable ) est très strident , Je recommande et remercie amazon et ce vendeur.