Reolink E331 5MP Indoor Pan-Tilt Wi-Fi Camera｜2.5K Resolution, 355° Pan, Dual-Band Wi-Fi

2880×1616 5MP@20fps｜1/2.7" Sensor｜F1.6 Large Aperture｜355°／90° Pan-Tilt｜Dual-Band Wi-Fi

Product Overview

The Reolink E331 is a mid-range indoor pan-tilt camera: 5MP (2880×1616), a 1/2.7" sensor, and a large F1.6 aperture, combined with 355° horizontal and 90° vertical pan-tilt coverage. Compared with the 3MP E321 in the same series, it offers higher resolution and a larger sensor; compared with the 4MP E1, it provides more light intake and dual-band Wi-Fi.

The official resolution is 2880×1616 (5 megapixels) @20fps. It features an f=4mm, F1.6 lens with IR-cut, a horizontal field of view of 87.5° and a vertical field of view of 45.4°, plus 12-meter infrared night vision. The pan-tilt range is 355°/90°, and the official specifications clearly state support for automatic tracking (Auto-Tracking).

Wireless connectivity supports IEEE 802.11 a/b/g/n/ac/ax dual-band Wi-Fi (2.4GHz／5GHz) and WPA3. It supports microSD cards up to 512GB. The camera measures Φ73×114mm and weighs 171g, with an operating temperature range of -10°C to 55°C. This is an indoor model, and the official specifications do not state an IP waterproof rating.

Reolink E331 camera body (official image)

Six Key Highlights

The Real-World Difference Between 5MP and a 1/2.7" Sensor

2880×1616 is a specification positioned between 2K and 4K, with a 16:9 aspect ratio and approximately 25% more pixels than 4MP. At this price point, the real difference lies in the sensor: a 1/2.7" sensor has approximately 40% more area than the 1/3" sensors commonly used in entry-level indoor cameras. Combined with the F1.6 aperture, this results in noticeably lower noise under indoor lighting.

Indoor lighting is often uneven: very bright near windows and very dark in corners. A larger sensor and wider aperture mean the camera does not need to apply heavy gain to compensate for dark areas, so the image will not be filled with noise. This is the most practical significance of the words “1/2.7"” in the specifications.

20fps is smoother than the common 15fps, and the difference is noticeable when watching children or pets move indoors. The trade-off is slightly larger file sizes, but indoor Wi-Fi is usually not the bottleneck.

• 2880×1616 5MP @20fps
• 1/2.7" CMOS｜f=4mm F1.6 with IR-cut
• Field of View 87.5°／45.4°

355°／90° Pan-Tilt and Automatic Tracking

The 355° horizontal range has an approximately 5° blind spot, usually at the rear of the camera where the cables are routed. Positioning this blind spot toward a wall effectively provides full coverage. The 90° vertical range extends from horizontal to directly downward, which is sufficient for viewing areas beside a bed, a pet cage, or the floor.

The official specifications clearly state support for automatic tracking: when a moving object is detected, the lens turns to follow it. For indoor use, note that tracking will keep the view moving. If you are monitoring a fixed area, such as a crib, it is recommended to turn off automatic tracking and retain only motion detection notifications.

• 355° Horizontal／90° Vertical
• Supports Auto-Tracking
• Tracking Recommended to Be Disabled for Fixed Monitoring Areas

Dual-Band Wi-Fi and WPA3

The official wireless specifications are 802.11 a/b/g/n/ac/ax, with support for 2.4GHz and 5GHz, and WPA3 encryption. For an indoor camera, the value of 5GHz is that it “won’t clash with the neighbors’ 2.4G.” The 2.4G band is extremely congested in Hong Kong homes, while 5GHz is usually much more stable.

Another factor is latency: the real-time viewing experience indoors depends heavily on the network. At close range, 5GHz offers lower latency and less jitter than 2.4GHz. If the camera and router are in the same room, 5GHz is recommended.

• 802.11 a/b/g/n/ac/ax Dual-Band
• Supports WPA3 Encryption
• 5GHz Recommended for Indoor Use

12-Meter Infrared and Nighttime Performance

The official infrared night vision range is 12 meters (40 feet). Indoor rooms are generally 3-5 meters deep, so 12 meters is more than sufficient. Actual image quality will be affected by reflections from walls and obstructions from furniture; for the best results, point the camera toward the main activity area rather than the ceiling.

This indoor camera does not have a spotlight (the official specifications do not list full-color night vision), so nighttime footage is in black-and-white infrared. If you need to see colors at night, such as a baby’s complexion, choose a model with a spotlight.

• 12-Meter Infrared
• Official specifications do not list full-color night vision (the indoor model has no spotlight)
• Black-and-white infrared footage at night

512GB storage and recording setup

Supports up to 512GB microSD, which is among the larger capacities available for indoor cameras in this class. Indoor scenes typically trigger recordings infrequently, so 512GB can store footage for a considerable length of time.

A high-endurance surveillance-grade card is recommended. With continuous overwriting, a standard card may develop bad sectors after just one or two years, which can create the false impression that recording has failed rather than the card itself being faulty.

• microSD up to 512GB
• Surveillance-grade card recommended
• Primarily trigger-based recording

Dimensions, power supply and actual placement

The camera measures Φ73×114mm and weighs 171g, making it compact enough to sit unobtrusively on a bookshelf. The official operating temperature is -10°C to 55°C, with humidity of 20%-85%, which is fully sufficient for indoor environments.

The official specifications for this indoor model do not list an IP water-resistance rating, so do not install it in a bathroom or outdoors. Power is generally supplied via USB (the official specification sheet does not list the power requirements, so we will not fill them in), and you should check whether there is a nearby power outlet when choosing its placement.

• Φ73×114mm／171g
• Operating temperature -10°C to 55°C
• Not waterproof; do not install in bathrooms or outdoors

What's in the box

The following describes the Hong Kong authorized-stock packaging contents. Actual accessories may vary by shipment batch; please contact us for confirmation before placing your order if you have any questions.

• The official product page does not provide an itemized packing list or power specifications. Indoor models generally include the main unit, a power cable and a mounting base. If you need to confirm the adapter specifications or base style, please contact us before placing your order.
• Packaging contents are subject to Reolink's official shipping configuration. The official product page does not provide an itemized packing list, and our store does not speculate on the quantity of accessories. If you need to confirm a particular accessory before ordering (bracket, screw pack, or whether a power supply is included), please contact us first.
• Hong Kong authorized stock, 2-year original manufacturer warranty and local support.

Suitable scenarios

The E331 is suitable for indoor locations where you need clear images and a wide range of coverage: living rooms, nurseries, pet areas and shop display areas.

• Living rooms and open-plan kitchens
• Nurseries and children's rooms
• Pet activity areas
• Shop display areas and checkout counters
• Offices and studios

Why choose this model

• 5MP with a 1/2.7" sensor for cleaner details in dark areas
• F1.6 large aperture
• 355°/90° pan-tilt with auto-tracking
• Dual-band Wi-Fi and WPA3
• microSD 512GB

Full specifications

Comparison within the same series

E321, E331, and E1 are three tiers in the same indoor pan-tilt camera series; the table below shows the official specifications, with the E331 you are viewing highlighted.

Frequently Asked Questions

Want to know where is the best place to position E331?

Send us a floor plan or a few photos of the room, and we can help you choose the best placement, identify potential blind spots, and determine whether a second camera is needed to cover the hallway.

Hong Kong-authorized stock｜2-year manufacturer's warranty｜Local support