Dali S253 II Thermal Monocular

• 384x288 thermal sensor: The higher sensor resolution gives the Dali S253 II a clearer thermal image than entry-level 256-class devices, making it easier to separate animals, people, and background detail at longer distances.
• 25 mm objective lens: This lens size balances field coverage and detection reach, so the monocular remains compact in the hand while still offering a stated detection range of 1120.00 m.
• 50.00 Hz refresh rate: A faster refresh rate keeps moving subjects looking smoother during scanning, which helps when tracking game or checking wider terrain from a moving position.
• WiFi, photo and video functions: Built-in wireless connectivity and onboard recording make it practical for sharing observations, saving footage, and reviewing what was seen after the session.
• Compact weather-resistant housing: With a 450.00 g body, waterproof and fogproof construction, and rechargeable power via USB-C port, the S253 II is easier to carry and simpler to keep ready for regular field use.

About the Dali Thermal Monoculars Series

Dali Thermal Monoculars sit in the brand’s outdoor thermal-imaging range as compact handheld devices built for observation rather than weapon mounting. Within this family, the S25X series uses uncooled focal-plane-array thermal detectors and focuses on practical field use for hunting, wildlife spotting, and general outdoor scanning in darkness, brush, or poor weather. The series is designed around one-handed handling, so it stays portable enough for constant carry while still offering the core functions expected from a modern thermal monocular.

A defining trait of the series is its mix of observation and digital utility. DALI equips these monoculars with an OLED display with 1440 × 1080 resolution, along with features such as Wi-Fi image transmission, hotspot tracking, picture-in-picture, digital zoom, and photo and video recording. That combination makes the range suitable not only for finding heat sources quickly, but also for documenting sightings and sharing the live image through a mobile device. Across the series, the emphasis is on straightforward thermal viewing, compact dimensions, and a feature set that supports real field use rather than bench-only specification depth.

About the Dali S253 II Thermal Monocular

The Dali S253 II Thermal Monocular is the higher-resolution variant in a compact 25 mm format, combining a 384x288 uncooled FPA sensor with 1.00x optical magnification for wide-area scanning at natural viewing scale. That makes it especially useful when the priority is to search terrain efficiently rather than zoom in narrowly from the start. Its 14.00 ° field of view, equivalent to 122.00 m/1000m, helps the user cover woodland edges, fields, tracks, and open ground with fewer sweeps, while the stated 1120.00 m detection range gives enough reach to pick up distant heat signatures before closing the distance for identification.

The thermal image is supported by a 50.00 Hz refresh rate, which improves the sense of fluid motion when panning or following moving targets. A 60.00 mK NETD sensor sensitivity level allows the device to show temperature differences clearly enough for general outdoor observation, especially where shape and heat contrast matter more than fine daylight detail. The display section lists an HD screen with 1280x960 resolution, giving the viewer a dense image that is easier to interpret during longer observation sessions.

In practical use, the S253 II is built around portability and simple power management. The 200.00 mm body and 450.00 g weight keep it manageable for handheld use, while the rechargeable battery and USB-C port simplify charging in the field or vehicle. WiFi connectivity, image capture, video recording, and video output add useful flexibility for documentation and sharing, and the waterproof, fogproof, shockproof construction supports use in variable outdoor conditions.

About Dali

DALI traces its origins to the Zhejiang Provincial Testing Technology Research Institute, established in 1984. The company is based in Hangzhou, Zhejiang, China, and was restructured in 2001 before being listed on the Shenzhen Stock Exchange in February 2008. In the thermal-imaging field, IRtech identifies itself as originating from DALI, linking the outdoor product line to the company’s broader infrared and optoelectronic background.

DALI’s expertise includes uncooled focal-plane-array detectors, infrared thermal-imaging cameras and systems, infrared core components, and wider optoelectronic systems. That background is relevant to handheld thermal devices such as the S253 II because it shows the company is not only assembling finished consumer products, but also working in the detector and imaging technologies that underpin them. Its outdoor range covers thermal monoculars, riflescopes, and binoculars, reflecting a clear focus on field observation and thermal imaging applications.

Main Features

• Magnification: 1.00 x
• Objective lens diameter: 25.00 mm
• Field of view: 122.00 m/1000m
• Field of view (angular): 14.00 °
• Close focus distance: 1.00 m
• Detection range: 1120.00 m
• Thermal sensor type: Uncooled FPA
• Sensor resolution: 384x288
• NETD: 60.00 mK
• Refresh rate: 50.00 Hz
• Display type: HD
• Display resolution: 1280x960
• Image capture: Yes
• Video recording: Yes
• Video output: Yes
• Connectivity: Wifi
• Built-in rangefinder: No
• Battery life: 4.00 h
• Power supply: Rechargeable Battery, USB-C port
• Dimensions: 200.00 mm x 71.00 mm x 71.00 mm
• Weight: 450.00 g
• Working temperature range: -20℃- +50℃
• Waterproof: Yes
• Fogproof: Yes
• Special features: Fogproof, Shockproof, Waterproof

Warranty

Dali provides a 2-year warranty for the S253 II Thermal Monocular. This gives defined coverage for the product over a stated ownership period rather than an open-ended warranty description.