SimpliSafe ENS304 Entry Sensor 4 Pack
- 4 contact sensors in the pack
- 1000 feet maximum range
- 6 volts DC, alkaline battery
- Screw-in or self-adhesive mounting
- White, no assembly required
- App control
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A four-pack of door and window contact sensors for people extending a SimpliSafe alarm across a whole house. They need the SimpliSafe system to work and are not standalone alarms.
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ASIN: B08HR8HYPSModel: ENS304Category: Door And Window Sensors
Overview
A house with several doors and windows can be covered by this pack of wireless contact sensors, each fixed to the frame by screws or self-adhesive. Each unit is battery powered and reports through the app, with no assembly required.
The reason to buy is a pack that covers many entry points in one purchase. The limit is the dependency on the SimpliSafe base, and battery replacement is the owner's job. The listing does not say whether batteries are included.
Who it's for
A multi-room house that already runs the brand's base station can use all four right away. Someone with only one entry point to cover, or with another alarm brand, does not need this pack.
Pros and cons
- Four sensors per pack
- Screws or adhesive mounting
- No assembly required
- Wireless with long listed range
- Needs the SimpliSafe base
- Battery inclusion not stated
- Tamper features not listed
Performance notes
Each sensor detects when its two halves separate and signals the base wirelessly, so range depends on walls and interference between the sensor and the base. Mounting it close to the frame edge gives the cleanest trigger. Alkaline cells need replacing on a schedule set by use.
Specifications
| Brand | SimpliSafe |
|---|---|
| Model | ENS304 |
| Dimensions & fit | |
| Item weight | 1.12 ounces |
| Item dimensions | 0.12 x 2 x 2.7 inches |
| Capacity & performance | |
| Maximum range | 1000 feet |
| Power & efficiency | |
| Power source | Battery powered |
| Battery type | Alkaline |
| Voltage | 6 volts DC |
| Construction & materials | |
| Color | White |
| Compatibility & installation | |
| Connectivity | Wireless |
| Installation | Screw in, self adhesive |
| Compatible Devices | Desktop, Laptop, Smartphone, Tablet |
| Included components | |
| Unit count | 4 count |
| Warranty & support | |
| Manufacturer Warranty Description | 1 year manufacturer |
| Other details | |
| Control Type | App |
| Sensor technology | Contact sensor |
| Alert Type | Motion |
| Assembly Instructions Description | No assembly required |
| BuiltIn Media | 4 Entry Sensor |
| Mfr Part Number | ENS304 |
Frequently asked questions
Is the SimpliSafe ENS304 pack a standalone alarm?
No. The title says it is compatible with the SimpliSafe Home Security System, and it contains four entry sensors only.
How do I install the SimpliSafe entry sensors?
The listing gives screw-in or self-adhesive installation and says no assembly is required.
How many sensors are in the SimpliSafe ENS304 pack?
Four entry sensors.