Aim-O ACOG Style  4X32 Red Dot with Illumination Source Fibre 

Magnification: 4x
Colour: BLACK
Optical fibre: RED (Auto Brightness function)
Light RED
Lens size: 32mm
Exit pupil diameter: 8mm
Length: 160 mm
Material: aluminium
Coating of the multi-layer lens
Waterproof, anti-fog and shockproof
Calibration adjustments
Anti-reflective, scratch-resistant surfaces
Standard 20mm slide
Weight: about 500g