Functional type:Infrared Night Vision. Magnification:7X(Optical magnification fixed). Optical lenses: F1.0/6mm. Diameter of the objective? 30 mm. Low light observation distance 3 m up. All black viewing distance 3m250m. The sensor Low illumination: HD CMOS. External SD card : support 8128G TF memory card(Not included). Screen: 1.5 inch. Working voltage : 3.7 V DC. Built-in battery: 900mah 18350 rechargeable lithium battery. Charging power supply: 5.0 V / 1000 ma adapter. Shell: Aluminum is the main metal. Impact resistance value: 5G. Product size :8.1in. The product design is exquisite, the ratio is big, the volume is small, the weight is light, the intensity is high. Products strive for high-strength impact design; all forces are face-to-face contact, surface force, to ensure product durability. The dividing and adjusting design adopts fast-adjusting and fast-locking design, which is flexible in operation and convenient in use. Anti-exposure eye mask design, to ensure that the use of night environment does not expose their own targets. 1 Strap for telescope. EASY TO FOCUS MECHANISM. STEP1: Twist barrel, make vision clear. STEP2: Twist the center focus diopter knob, adjust the clarity of the vision distance disired. STEP3: Twist the right diopter knob, adjust the clarity for clear comfortable viewing experience. The night-vision device’s cursor can be moved up, down, left and right by pressing keys. The focal length of the night vision instrument is automatically fixed.