SimpliSafe ENS301 Entry Sensor
- Control Type: Remote
- Battery Description: Lithium
- Builtin Media: Entry sensor, extra adhesives, screws
- Color: White
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact add-on sensor for SimpliSafe Gen 3 systems, worthwhile once the base station is already in place and another entry point needs covering.
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ASIN: B08B3J12L7Model: ENS301Category: Door And Window Sensors
Overview
The SimpliSafe Entry Sensor is a two-piece magnetic contact sensor for a door, window or cabinet, built to work with the SimpliSafe Gen 3 home security system. It ships with a pre-installed battery and mounts with peel-and-stick adhesive or the included screws.
This is an accessory, not a standalone alarm: it needs a SimpliSafe Gen 3 base station already in place to report entry events, chime or trigger an alarm. Its compact size is the main design goal, so it sits on a window or door frame with minimal visible hardware. SimpliSafe's Secret Alerts option lets a household get a silent phone notification instead of a full alarm, useful for monitoring a room without announcing it.
- Compact two-piece magnetic contact sensor
- Compatible with the SimpliSafe Gen 3 system
- Pre-installed long-lasting battery
- Optional silent Secret Alerts per sensor
Who it's for
Fits an existing SimpliSafe Gen 3 owner who needs to add or replace a door or window sensor. It will not work as a first purchase without that base station already installed. Anyone starting from zero needs a SimpliSafe system kit first, not this sensor alone.
Pros and cons
- Compact enough to mount on nearly any window, door or cabinet
- Battery pre-installed, no separate purchase needed
- Peel-and-stick or screw mounting depending on preference
- Secret Alerts option for a silent notification instead of a siren
- Only works with a SimpliSafe Gen 3 base station already installed
- No standalone alarm function on its own
Performance notes
The sensor pairs two magnetic halves, one on the frame and one on the moving door or window, and reports open and close events wirelessly to the SimpliSafe base station. The base station is what decides whether that event triggers a chime, a full alarm, or a silent Secret Alert to the connected phone, so behavior depends entirely on how the system is configured.
Specifications
| Brand | SimpliSafe |
|---|---|
| Model | ENS301 |
| Dimensions & fit | |
| Item Dimensions L X W X H | 2 × 0.1 × 2.7 inches |
| Item weight | 0.07 pounds |
| Size | Compact |
| Capacity & performance | |
| Maximum Range | 1000 feet |
| Power & efficiency | |
| Battery Description | Lithium |
| Power Source | Battery |
| Construction & materials | |
| Color | White |
| Compatibility & installation | |
| Compatible Devices | Desktop, Laptop, Smartphone, Tablet |
| Mounting Type | Wall Mount, Door Mount |
| Included components | |
| Units | 1 |
| Warranty & support | |
| Manufacturer Warranty Description | 1 year manufacturer |
| Other details | |
| Control Type | Remote |
| Builtin Media | Entry sensor, extra adhesives, screws |
| Type | Security & Surveillance |
| Mfr Part Number | ENS301 |
| Number Of Batteries | 1 Lithium Metal batteries required. (included) |
| Number Of Items | 1 |
| Sensor Technology | Contact Sensor |
Frequently asked questions
Will the SimpliSafe Entry Sensor ENS301 work without a SimpliSafe base station?
No, it needs a SimpliSafe Gen 3 base station already set up to receive its signal and trigger a chime or alarm.
How is the SimpliSafe Entry Sensor ENS301 mounted?
It can be installed with the included peel-and-stick adhesive or permanently mounted with the included screws.
Does the SimpliSafe Entry Sensor ENS301 need battery replacement right away?
No, it ships with a pre-installed battery rated for long-lasting use.