The maximum effective range is as follows: a. Indoor + Nighttime: MAX 4M, with slight variations due to different lighting conditions, ranging from 3.5M. b. Outdoor, cloudy daytime: 3M to 3.5M. c. Outdoor, daytime: The distance may be reduced based on different sunlight intensities. - Light intensity below 10,000: Maximum 3.8 meters. - Light intensity between 10,000 and 45,000: Maximum 3.8 meters to 3 meters. - Light intensity between 45,000 and 50,000: Maximum 3 meters to 2.5 meters. - Light intensity above 70,000: Maximum 2.2 meters. * As light intensity increases, the scanning angle narrows linearly with increasing distance. If you wear auxiliary focus stickers or other DIY reflective stickers, both indoors and outdoors, you can ignore the effects of lighting and infrared, with a range of 4M.