1 / 6eufy Security Entry Sensor E20 door and window contact sensor
The eufy Security Entry Sensor E20 is a contact sensor for doors and windows that requires a compatible HomeBase. Its left- or right-side installation and temporary bypass button are useful for everyday entry, but it depends on the right hub and software versions.
At a glance
- Dual-side detection lets the magnet sit on either the left or right of the sensor unit.
- A bypass button temporarily disarms this sensor so a door can be opened without triggering an alarm. Other sensors remain active.
- The listing gives an open-field HomeBase communication range of up to 656 ft (200 m).
- Can trigger HomeBase chimes and automation rules through the eufy app, subject to the stated compatibility and app requirements.
Reference price: £29.99
Price checked: 12 Nov 2026
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Pros and cons
Pros
- Left- or right-side magnet placement offers more flexibility when fitting the sensor to a door or window.
- The 120-second bypass can temporarily silence this sensor without disarming other sensors.
- The stated five-year battery life may reduce replacement frequency, though it is based on internal lab testing.
Cons
- A compatible HomeBase is required, so this is not a standalone sensor.
Technical specifications
12 specifications| Brand | eufy Security |
|---|---|
| Model | Entry Sensor E20 |
| Colour | White |
| Sensor technology | Contact Sensor |
|---|---|
| Mounting type | Door Mount |
| Detection distance | Detection works within a 0.8 inch / 2 cm radius. |
| Installation orientation | Supports both left and right-side installation for quick, error-free setup. |
| Control method | App |
|---|---|
| Compatible devices | HomeBase Mini, HomeBase 2, HomeBase 3, HomeBase Pro, eufy app |
| Maximum range | 200 Metres |
| Battery | 1 A batteries required. (included) |
|---|---|
| Voltage | 3 Volts |
What to know before buying
Listing details to confirm
The listing conflicts on HomeBase requirements: the title says EU versions, while the compatibility details list HomeBase Mini, 2, 3 and Pro without an EU-only condition. It also gives a 200-metre open-field range, not a guaranteed indoor distance. Check your HomeBase model and firmware. The stated five-year battery life is an internal-lab estimate and may vary with use. The bypass requires a two-second press and lasts 120 seconds. Chimes are listed for Mini, 2 and 3, while automation requires eufy app v6.0.00 or above.
What’s in the box
Included- Sensor
Who is it for?
A good fit for
- Existing eufy HomeBase owners adding door or window contact monitoring, provided their hub meets the required version.
- Households that want to open a monitored door briefly without disabling their other sensors.
Less suited to
- Buyers without a compatible HomeBase or those seeking a standalone sensor.
- Anyone needing a guaranteed 200-metre range through walls or in a typical home.
Customer reviews on Amazon
- 5 stars
78% 78% - 4 stars
14% 14% - 3 stars
3% 3% - 2 stars
2% 2% - 1 star
3% 3%
Customer feedback describes the sensor as reliable and easy to set up, with positive comments about quality. Connectivity feedback is mixed. These reports may matter particularly where the sensor is far from the HomeBase, since the listed 200-metre range is an open-field claim rather than an indoor guarantee.
Positive themes
- Customers report reliable door and window detection.
- Customers describe setup as easy and comment positively on product quality.
Mixed feedback
- Connectivity receives mixed customer feedback.
Frequently asked questions
Does the eufy Entry Sensor E20 work without a HomeBase?
No. The listing says a HomeBase is required. It names HomeBase Mini, HomeBase 2, HomeBase 3 and HomeBase Pro, with minimum firmware versions. Confirm your hub and its version before buying.
What does dual-side detection mean?
The magnet can be fitted on either side of the main sensor unit, allowing installation for left- or right-side opening arrangements.
How does the bypass button work?
The listing says to press the button for two seconds. It temporarily disarms this sensor for 120 seconds, while other sensors remain active.
How long does the battery last?
The listing claims up to five years under normal conditions based on internal lab testing. Actual battery life may vary with use.
What is the stated communication range?
The listed maximum is 200 metres, based on open-field testing with HomeBase. The page does not establish that range indoors.
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