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Preventive Security hardware
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Preventive Door & Window Sensor Kit
Pack
2 transmitter + magnet sets
Gap
Up to 24 mm
Battery
Approx. 2 years (CR2032)
Tamper
Rear tamper switch
Alarm Systems & Sensors In stock

Preventive Door & Window Sensor Kit

Model PV-DW2 4.2 141 reviews

$24.99 per unit · volume pricing applies at 5 and 20 units

Two-piece contact sensor, pack of two, with a 24 mm gap tolerance.

Unit price at this quantity: $24.99

  • No payment now. You receive an invoice before paying.
  • Quote back within 1 business day, dispatch in 2 business days.
  • 24-month hardware warranty, 30-day returns.
  • Free ground shipping on US orders over $150.

Volume pricing

1–4 units $24.99 / unit standard
5–19 units $23.74 / unit save 5%
20+ units $21.99 / unit save 12%

Tiers apply automatically per line in the quote cart. Larger orders are quoted individually.

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Overview

A magnetic contact for the doors and windows that open. The 24 mm gap tolerance means it still reads correctly after a season of the frame moving, and the rear tamper switch reports if someone tries to lift the transmitter off the frame.

Key features

  • Pack: 2 transmitter + magnet sets
  • Gap: Up to 24 mm
  • Battery: Approx. 2 years (CR2032)
  • Tamper: Rear tamper switch

Specifications

Model PV-DW2
Gap tolerance Up to 24 mm
Radio 915 MHz bidirectional, 250 m open air
Battery CR2032, approx. 2 years
Tamper Rear tamper switch on transmitter
Inputs External contact input on transmitter
Mounting Adhesive pads and screws included
Dimensions Transmitter 65 x 18 x 15 mm, magnet 65 x 12 x 14 mm

In the box

  • 2 transmitters
  • 2 magnets
  • 2 CR2032 batteries
  • Adhesive pads and screws

Customer reviews

4.2 4.2 out of 5 · 141 verified orders
5.0 April 2025

Cheapest way to start

Two sets for under $25. I covered every ground-floor window for less than a takeaway dinner.

S. Bianchi · Verified order

4.0 September 2025

Mind the gap

24 mm is fine on timber frames. On a warped shed door I had to pack the magnet out with a shim.

N. Sato · Verified order

5.0 March 2026

Tamper switch earns its place

The rear tamper switch caught a window being forced from the outside before the contact even opened.

C. Osei · Verified order

Questions about this product

Still unsure? Ask us
How many sensors can the hub handle?

The gateway pairs up to 30 sensors. The spec table lists supported types; the door/window, PIR, glass-break and smoke kits all connect to the same hub.

Do I need a monitoring contract?

No. The siren and strobe are self-contained. If you want 24-hour monitoring, the hub can connect to a monitoring service, but it is optional.

How loud is the siren?

The siren is 110 dB at one metre, loud enough to be heard across a street in normal conditions.

Can I extend the system later?

Yes. Add sensors one at a time from the hub settings; the quote cart makes mixing and matching parts easy.

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