Magnification: 1 Unlimited relief Accessories: lens cover, lens cleaning cloth Type of lighting: 20-level brightness of red and green masks, which can provide maximum flexibility under different lighting conditions Focus type: fixed Material: Aluminum alloy aircraft grade Easy to install, fits any 20mm slide rail Height adjustment and side view Shockproof and weatherproof materials Easy to install, built-in and quick to remove Battery: CR123 * 1 battery ( including battery ) Function keys: Up arrow button: turn on and increase brightness Down arrow button: turn on and reduce glare Up and down arrow keys: close, press these keys at the same time to close