Philips LRM3320W Window and Door Alarm 4 Pack
- Power source: Battery
- Control Type: Touch
- Sensor Technology: Magnetic Contact Sensor
- Maximum Range: 0.5 inches
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
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ASIN: B08FXX18WZModel: LRM3320W/27Category: Home Security Systems
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Overview
The Philips Personal Security Window and Door Alarm is a battery-operated, standalone 4-pack that sounds a 120-decibel siren or a chime when a door or window opens, with no hub or app required.
Unlike the SimpliSafe sensors above, this one needs nothing else to function: a three-position switch on the unit itself picks off, chime or alarm. That makes it a cheap way to cover extra entry points a bigger system does not reach, or to run a security layer with zero monthly cost. It mounts with double-sided tape rather than screws, so placement is easy to change later.
- 120-decibel alarm or chime, switch-selectable
- Set of 4 for multiple entry points
- Battery-operated, no hub or app required
- Double-sided tape installation, no tools needed
Who it's for
Good for apartments, RVs, garages or a household that wants audible alerts on specific doors without buying a full system. Not the choice for anyone who wants app notifications or remote monitoring.
Pros and cons
- Switch between alarm and chime modes on the unit itself
- No hub, app or subscription needed
- Peel-and-stick mounting is fast to install and reposition
- Chime tone struck one reviewer as harsh rather than pleasant
- Double-sided tape mount is less secure than a screwed sensor
- One unit reported malfunctioning and staying on after a period of use
Performance notes
Each unit uses a magnetic sensor between the frame and door or window; separating the two halves trips either a 120-decibel siren or a chime tone depending on the switch setting. Four LR44 batteries power the unit, with a test button and low-battery LED built in, and double-sided tape handles mounting without tools.
Specifications
| Brand | Philips |
|---|---|
| Model | LRM3320W/27 |
| Dimensions & fit | |
| Item Weight | 0.4 pounds |
| Item Dimensions L X W X H | 7.9 × 4.9 × 1 inches |
| Size | 4 count |
| Capacity & performance | |
| Maximum Range | 0.5 inches |
| Audible Noise | 120 db |
| Power & efficiency | |
| Power source | Battery |
| Voltage | 1.5 volts |
| Construction & materials | |
| Color | White |
| Compatibility & installation | |
| Mounting Type | Adhesive Mount |
| Compatible devices | Doors, Windows |
| Included components | |
| Unit Count | 4 |
| Warranty & support | |
| Manufacturer Warranty Description | 1 year |
| Other details | |
| Control Type | Touch |
| Sensor Technology | Magnetic Contact Sensor |
| Number of items | 1 |
| Builtin media | 4 Alarms |
| Mfr Part Number | LRM3320W/27 |
| Item Type Name | Door And Window Alarm |
Frequently asked questions
Can the Philips LRM3320W/27 alarm work without Wi-Fi or an app?
Yes, it is fully standalone and battery-operated, with an on-unit switch for off, chime or alarm.
What batteries does the Philips window and door alarm use?
It runs on four included LR44 button batteries and has a low-battery LED and test button.