The Asp handheld observational thermal monocular is equipped with a 640×512 infrared detector and a 1024×768 OLED display. It supports functions of observation, hot spot tracking, distance measurement, Wi-Fi hotspot, and so on. The high-sensitivity built-in thermal detector provides you with clear view even in total darkness. The monocular is mainly applied to scenarios such as patrolling, law enforcement, searching and rescuing, drug enforcement, anti-smuggling, criminal seizing, hiking, travel, and hunting, etc. AGM ASP TM35-640 MED RANGE THERMAL MONOCULAR FUNCTIONS: Distance Measurement: The device realizes distance measurement function after marking the top and bottom of target, and input the target height. Hot Spot Mark: The device detects and marks the hot spot of highest temperature. Mode Switch: Device supports pallet switch and distance measurement. Storage: Built-in memory module supports video recording/snapshot capturing. Digital Zoom: Device supports 1×, 2×, and 4× digital zoom. Wi-Fi Hotspot: Device can capture snapshots, record videos, and set parameters via APP after being connected to your phone. 640×512 resolution, high sensitivity detector Adaptive AGC, DDE, 3D DNR 1024×768 resolution 0.39-inch OLED display Built-in memory supports video recording/snapshot capturing Wi-Fi hotspot Built-in rechargeable Li-Ion battery Up to five hours continuous running (with Wi-Fi hotspot function off)