SimpliSafe ENS304 Entry Sensor 4 Pack
- Control Type: App
- Alert Type: Motion
- Assembly Instructions Description: No assembly required
- Battery Cell Type: Alkaline
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A practical way to add coverage to several entry points on an existing SimpliSafe system in one order, rather than buying sensors one at a time.
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ASIN: B08HR8HYPSModel: ENS304Category: Door And Window Sensors
Overview
This is a four-pack of SimpliSafe's Entry Sensor, the same magnetic door and window contact sold individually as the ENS301, bundled for covering several entry points on a SimpliSafe system at once.
Buying four together suits a household adding sensors to more than one door or window in the same order, at a lower per-sensor cost than buying singles. It ships with the same Secret Alerts option, letting specific sensors send a silent phone notification instead of triggering the audible alarm. As with the single sensor, this pack cannot function without a SimpliSafe base station already running the rest of the system.
- Pack of 4 magnetic entry sensors
- Compatible with the SimpliSafe home security system
- Pre-installed batteries in every sensor
- Per-sensor Secret Alerts for silent notifications
Who it's for
Fits a SimpliSafe owner outfitting several windows or doors in one purchase, or replacing sensors across a home. It is not a starting point for someone without a SimpliSafe base station already installed.
Pros and cons
- Four sensors in one order at a lower cost than buying singly
- Compact enough for windows, doors or cabinets
- Pre-installed batteries on every sensor
- Peel-and-stick or hardware mounting either works
- Requires an existing SimpliSafe base station to function
- No standalone alarm capability without the system
Performance notes
Each sensor in the pack pairs independently with the SimpliSafe base station over the system's wireless network, reporting open and close events per sensor. The base station applies whatever rule is set for each one, whether that is a chime, a full alarm, or a silent Secret Alert.
Specifications
| Brand | SimpliSafe |
|---|---|
| Model | ENS304 |
| Dimensions & fit | |
| Item Dimensions | 0.1 × 2 × 2.7 inches |
| Item weight | 0.07 pounds |
| Capacity & performance | |
| Maximum Range | 1000 feet |
| Power & efficiency | |
| Battery Cell Type | Alkaline |
| Power Source | Battery |
| Voltage | 6 volts |
| Construction & materials | |
| Color | White |
| Compatibility & installation | |
| Compatible Devices | Desktop, Laptop, Smartphone, Tablet |
| Connectivity Technology | Wireless |
| Installation Method | Screw In,Self Adhesive |
| Included components | |
| Units | 4 |
| Warranty & support | |
| Manufacturer Warranty Description | 1 year manufacturer |
| Other details | |
| Control Type | App |
| Alert Type | Motion |
| Assembly Instructions Description | No assembly required |
| Builtin Media | 4 Entry Sensor |
| Type | Sensor |
| Mfr Part Number | ENS304 |
| Sensor Technology | Contact Sensor |
Frequently asked questions
Does the SimpliSafe ENS304 4-pack need a base station?
Yes, each sensor in the pack requires an existing SimpliSafe base station to report entry events and trigger a chime or alarm.
Can each sensor in the ENS304 pack be set up differently?
Yes, each sensor can be configured on its own, including a silent Secret Alert instead of an audible alarm.
How are the sensors in this SimpliSafe pack mounted?
Each one can be installed with peel-and-stick adhesive or the included hardware for a permanent mount.