They report an opening, which is earlier than reporting a presence · review
A pack of six standalone door and window alarms that TECKNET states trigger when the two halves separate by more than 2 cm (0.8 in), with three volume levels and three modes, mounted with the supplied adhesive pads.
The conclusion Six alarms that publish their trigger gap, 2 cm. Clean the frame properly and it stays where you put it.
This listing sells six contact alarms, not one. And TECKNET prints what is worth knowing about each: the gap at which it triggers.
The gap at which it triggers. That single figure decides whether the sensor suits a door, and in this hub only the Sone and the SONOFF publish it too.
Two centimeters is generous, which is good on a window that closes onto a deep recess and less good on a sliding patio door — where somebody can open a 15 mm (0.59 in) gap and reach through before the alarm decides anything has happened. Match the figure to the opening.
The pads need care. Applied to a cold, dusty vinyl frame in December, they may let go, and the sensor ends up on the floor.
Clean the surface with alcohol, apply above 10 °C (50 °F), press hard for thirty seconds, and leave it a day before testing. That is the whole installation.
Which is what makes the same unit suitable for a bedroom window and a shed door. A device that can only be deafening is a device that gets removed from half the places it should be.
TECKNET states a mini format that fits in a bag, batteries to replace when the alarm stops responding, and a 36-month warranty for registered users. When fitting, the sensor must sit no more than 2 cm (0.8 in) from the arrowed side of the alarm.
Six openings — the pack holds six —, a local noise, and an owner who will clean the frame first.
Listed but with no offer on the American Amazon store — the reference exists there and nobody is currently selling it.
Prices and availability are what Keepa reported on the date this page was updated; both move.
| Type | Standalone door and window alarms, pack of 6 |
|---|---|
| Trigger | Separation greater than 2 cm (0.8 in), stated by TECKNET |
| Volume | Three levels |
| Modes | Alarm (siren until closed), chime (short tone) or off |
| Uses | Window, pool, shed, garage, sliding door |
| Mounting | Adhesive pads supplied |
| Warranty | 36 months for registered users |
| Amazon reference | B0BY8ZH4V7 |
| EAN | 5056243607891 |
Because it is the specification that decides whether the sensor works on your window, and in this hub only the Sone (7 mm) and the SONOFF (20 mm) state it too. Two centimeters is generous — good on a window that closes tightly, less good on a sliding door where somebody can open a 15 mm (0.59 in) gap and reach through without triggering it.
On a clean, dry, warm frame, yes. On a cold vinyl frame in December, applied without cleaning, it may come off. Clean with alcohol, apply above 10 °C (50 °F), and press for thirty seconds.
TECKNET names them: alarm, a siren until the two halves meet again; chime, a short tone; and off. That lets the same unit announce a door during the day and defend it at night. It is the same dual use as the standalone motion alarms here, and it is what keeps the device in service rather than armed and forgotten.
8.1/ 10
Six alarms that publish their trigger gap, 2 cm. Clean the frame properly and it stays where you put it.
A reference exists on these Amazon stores: France, Germany, Italy, Spain, United Kingdom, United States. Listed is not the same as in stock — availability changes daily.
Details checked on September 2, 2026.
A window, a shed or a sliding door where a local noise is the whole requirement.
Specifications: the manufacturer sheet for home security products and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
For Smartvest Pro · wireless opening detector · triggers configured scenarios · doors and windows
The opening detector for ABUS's Smartvest Pro alarm. It reports unauthorized opening of doors, windows and patio doors, and triggers whatever scenarios have been configured on the panel.
Best for: An ABUS Smartvest Pro system being extended door by door.
90 dB standalone siren · 3.54 × 1.18 × 0.79 in and about 0.08 lb, both published · 2 AAA, NOT included · a three-step install written out · five units for ten dollars · no gap figure, no battery life, no tamper detection
Five alarms for ten dollars with their dimensions and weight published — two figures the cheapest sirens here usually leave out.
Best for: Five openings on a tight budget, where the body has to be measured against a shallow frame first
≈ $10
120 dB alarm or chime, switched on the side: OFF / chime / alarm · 4 LR44 cells SUPPLIED · a battery TEST BUTTON and a low-battery LED, the only test button on this shelf · double-sided tape included · no gap figure, no battery life, no tamper detection
The only sensor here with a button that tells you the battery is still good — which on an alarm nobody checks is worth more than it sounds.
Best for: A household that wants a chime for the back door in the day and an alarm on it at night
≈ $19
