Focal length and focus could be adjusted freely without opening up crust.

Specifications:

Housing Bracket VandalProof Design

1/3-Inch Sony Super Had CCD

Built-in 24 pieces IR-LED

Infrared Luminary: 24 pieces IR-LED,Life:100000hrs.
Wavelength:850nm
Viewing Angle :45
Illuminate distance:More than 20m
Illuminator Active Limit:10 Lux

Horizontal Resolution: 420TVL
Minimum Illumination: 0.5Lux/F1.2, ,0Lux(IR On)
Lens mount: Auto Iris Varifocal Lens 4-9mm/F1.6

Power Source: DC 12V
Dimension: 120mm(￠)85mm(H)
Weight: 800g