400x300 metal encapsulated infrared detector with TEC, good imaging effect The screen refresh rate of 50Hz can enable you to obtain a smoother picture, restore the real scene 400x300 IR high-resolution IP67 protection grade, with high-strength impact resistance, waterproof and dustproof, no fear of cold and heat, strong and durable, can adapt to various outdoor complex environments. This series is an economical civil infrared thermal imaging sight, including 25mm / 35mm / 50mm lenses