SimpliSafe ENS301 Entry Sensor
- Contact sensor for doors and windows
- Gen 3 SimpliSafe systems
- 1000 feet maximum range
- Battery powered, 1 lithium battery required and included
- Wall or door mount, adhesives and screws in the pack
- White finish
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A door and window contact sensor made for the third-generation SimpliSafe alarm. It does not run on its own, so it only makes sense if you already own the base.
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ASIN: B08B3J12L7Model: ENS301Category: Door And Window Sensors
Overview
A contact sensor attached to a door or window frame reports each time the opening moves, and it talks to the home security base over a wireless link. The pack includes extra adhesives and screws, so it can be stuck on or screwed into place.
The reason to buy is an addition that covers one more entry point on an existing SimpliSafe setup. The limit is that it targets one system generation, with no mention of other platforms. It is battery powered, so the cell needs replacing eventually.
Who it's for
Extending an existing SimpliSafe alarm to a new entry point is the use case. It is not for someone starting from nothing, because it needs the base system, and it is not listed for other security platforms.
Pros and cons
- Built for one system generation
- Adhesive or screw mounting included
- Battery included in the listing
- Small, plain white body
- Other systems not listed as compatible
- Battery life not stated
- Tamper features not listed
Performance notes
The sensor detects when its two sides move apart and sends that event wirelessly to the security base. Range depends on walls and interference between the sensor and the base. Placing it on the door side and frame side at a close gap matters more than the rated distance.
Specifications
| Brand | SimpliSafe |
|---|---|
| Model | ENS301 |
| Dimensions & fit | |
| Item dimensions | 2 x 0.12 x 2.7 inches |
| Item weight | 1.12 ounces |
| Size | Compact |
| Capacity & performance | |
| Maximum range | 1000 feet |
| Power & efficiency | |
| Power source | Battery powered |
| Construction & materials | |
| Color | White |
| Compatibility & installation | |
| Mounting type | Wall mount, door mount |
| Compatible Devices | Desktop, Laptop, Smartphone, Tablet |
| Included components | |
| Unit count | 1 count |
| Warranty & support | |
| Manufacturer Warranty Description | 1 year manufacturer |
| Other details | |
| Sensor technology | Contact sensor |
| Batteries | 1 lithium metal battery, included |
| Included | Entry sensor, extra adhesives, screws |
| Control Method | Remote |
| Item Type Name | Security & Surveillance |
| Mfr Part Number | ENS301 |
Frequently asked questions
How big is the SimpliSafe ENS301 entry sensor?
The listing gives 2 x 0.12 x 2.7 inches and a weight of 1.12 ounces.
Does the SimpliSafe ENS301 come with a battery?
Yes. The listing says one lithium metal battery is required and included.
What mounting hardware comes with the SimpliSafe ENS301?
The listing names extra adhesives and screws with the sensor.
Does the SimpliSafe ENS301 work without a SimpliSafe base?
No. The title says it is compatible with the Gen 3 home security system, and no standalone use is described.