557 holographic red dot

Magnification: 1.0x
2. Window: 30x22mm
Length: 100x50x65mm
Weight: 220 grams
5. Eye-to-eye distance (interocular gap): None
6. Multi-layer optical coating, high-hardness lens design, BB shot does not break
7.10-magnitude brightness red and green division (can be used in strong sunlight at noon)
8. Auto Shutoff: 2-hour inactivity automatically turns off to save power
Battery: 2 AA batteries

10. Rainproof and Shockproof
11. High-strength aerospace aluminum alloy, secondary anodized