eufy Security Door Window Entry Sensor Review (2026): A Spec-Based Look

What stands out

• 2-year battery life using a single CR123A cell for 800 days of monitoring
• 100-decibel siren on the HomeBase triggers when forced entry is detected
• Compact dimensions of 1.1 x 0.87 x 2.91 inches fit most frames
• Requires eufy Security HomeBase to connect and send smartphone alerts
• Optional 24/7 professional monitoring service for emergency response

Who it fits

Key specs explained for this sensor

Battery life: 800 days

The listing states one CR123A battery provides 800 days of monitoring. This means you replace the power source roughly every two years. You benefit from low maintenance compared to sensors requiring frequent changes. This duration suits busy homeowners who prefer set-and-forget devices. Compare this against sensors with shorter battery lives that demand more regular upkeep.

Size: 1.1 x 0.87 x 2.91 inches

The sensor unit measures 1.1 inches in width, 0.87 inches in height, and 2.91 inches in length. This compact form factor allows it to fit discreetly on most door or window frames. You benefit from a design that does not obstruct views or require large mounting spaces. Compare this size to bulkier alternatives that may look out of place on smaller windows.

Siren: 100-decibel

The HomeBase triggers a 100-decibel siren when forced entry is detected. This volume is loud enough to startle intruders and alert neighbors or household members. You benefit from an immediate audible deterrent without needing external speakers. Compare this decibel level to quieter systems that may fail to discourage unauthorized access or notify people nearby effectively.

Weight: 2.4 ounces

The unit weighs 2.4 ounces, making it lightweight and easy to handle during installation. You benefit from simple mounting without needing heavy-duty adhesives or complex hardware. This weight suits renters or those who move frequently and need portable security solutions. Compare this to heavier sensors that may require more robust mounting surfaces or professional installation services.

Design and Build Quality

According to the listing, this eufy Security entry sensor features a compact, white design intended for doors and windows. The main unit measures 2.91 inches in length, 1.1 inches in width, and 0.87 inches in height. It weighs 2.4 ounces. A separate magnet component completes the pair. This small footprint allows you to mount the device on various frame types without drawing attention. The white finish blends with standard door and window trim in most homes. You do not need to worry about bulky hardware interfering with the operation of your entry points.

The listing includes three mounting screws in the package. This hardware ensures you can secure both the sensor and the magnet firmly to your chosen surface. The compact layout means the gap between the two pieces remains minimal when closed. This tight fit helps maintain reliable detection. You can place these sensors on interior or exterior doors and windows. The versatile size accommodates standard residential frames. The design prioritizes unobtrusive placement while keeping the detection mechanism accessible. You get a simple, functional unit that fits seamlessly into your existing security setup. The build focuses on practical installation rather than complex aesthetics. This approach keeps the device ready for immediate deployment on any frame you select.

Setup and everyday use

Installation begins by mounting the sensor and magnet on your door or window frame. The listing includes three mounting screws to secure the units in place. You must pair this device with an eufy Security HomeBase. The sensor does not operate independently. This requirement means you need a compatible hub to enable any functionality. Once installed, the unit relies on a single CR123A battery. The listing states this power source provides 800 days of monitoring. This implies you will replace the battery approximately every two years. Daily use centers on detection alerts. When the sensor detects a forced entry, it triggers a 100-decibel siren on the HomeBase. You can enable or disable this siren feature through your system settings. The system also sends a notification to your smartphone when the alarm is activated. This allows you to monitor your home remotely. The compact design fits standard door and window frames without obstructing their operation. The white color blends with most interior decor. You may also opt for a 24/7 professional monitoring service. This optional service provides emergency police, fire, and medical response when your alarm system is triggered. This adds a layer of protection beyond local alerts. The package includes the entry sensor, battery, magnet, screws, and an owner’s manual. Setup is straightforward if you have the required HomeBase. The process involves physical mounting and digital pairing. No complex wiring is needed. The device remains on standby until triggered. The long battery life reduces maintenance frequency. You benefit from consistent protection with minimal upkeep. The system responds instantly to breaches. The siren provides a deterrent. The smartphone alert keeps you informed. This setup suits users seeking low-maintenance security for entry points.

Before You Buy This Sensor

You must own an eufy Security HomeBase to use this device. The sensor does not connect directly to your Wi-Fi or phone. It relies on the base station for communication. Without the base, the unit is inactive. You should also check if the optional 24/7 professional monitoring service fits your security goals. This service adds police, fire, and medical response when the alarm triggers. Consider the 100-decibel siren feature. You can enable or disable it via the app. This allows you to adjust alert levels for your household. Battery replacement is straightforward. One CR123A battery lasts 800 days. You will need to keep spare batteries on hand. This sensor is one of 1 options here. It suits users who already have the eufy ecosystem. It is less suitable if you want standalone sensors without a central hub. Verify your door or window frame can accommodate the 2.91-inch length. The compact design fits most standard frames.

Check before you buy

• Confirm you have an eufy Security HomeBase.
• Check if 24/7 monitoring fits your needs.
• Verify frame size fits the 2.91-inch sensor.
• Keep spare CR123A batteries ready.

The product at a glance

1

eufy Security Door and Window Entry Sensor

Best for: Users with eufy HomeBase needing compact sensors

Power Source

Battery

Placement

Indoor

Features

Siren

Color

White

Dimensions

2.91 × 1.1 × 0.87 inches

Weight

2.4 ounces

View on Amazon: eufy Security Door and Window Entry Sensor Affiliate link

This eufy Security entry sensor detects open and closed doors or windows. It requires a HomeBase to function. The unit runs on one CR123A battery for up to 800 days. It measures 1.1 inches wide and 0.87 inches high. A 100-decibel siren triggers on the HomeBase when forced entry is detected. It suits users who want long battery life and compact sensors for their alarm system.

Pros

• 2-year battery life on a single CR123A battery
• 100-decibel siren alerts on HomeBase
• Compact 1.1-inch width fits most frames
• Detects both opened and closed states

Cons

• Requires eufy Security HomeBase to operate
• No standalone wireless connectivity without base
• Only monitors one entry point per unit

Good fit if

• You already own a compatible eufy HomeBase
• You need compact sensors for narrow window frames
• You want minimal battery maintenance for years

Skip if

• You do not have an eufy HomeBase
• You need standalone sensors without a hub
• You require motion detection in this unit

Verdict: eufy Security Entry Sensor White is a compact, long-lasting sensor for users with a HomeBase. It fits well in tight spaces and offers reliable entry detection for your alarm system.

Specifications side by side

Frequently asked questions

See also

• eufy security entry sensor alternatives
• best eufy security security camera systems under 300
• eufy security eufy video doorbell review
• eufy security video doorbell review