The 
Nuprol Optics 1-4x28 RGB Rifle Scope is a variable magnification scope primarily designed for airsoft use, featuring red, green, and blue illuminated reticle options. 
Key Specifications
According to Nuprol.com, the manufacturer's website, the primary specifications for the Nuprol Optics 1-4x28 RGB Rifle Scope are as follows: 
Brand: Nuprol
Magnification: 1x to 4x variable zoom
Objective Diameter: 28 mm
Tube Diameter: 25.4 mm (1 inch)
Focal Plane: Second Focal Plane (SFP)
Illuminated Reticule: Yes, Red/Green/Blue (RGB) illumination
Reticule Type: Wire
Sealing Gas: Nitrogen filled for fogproof performance
Waterproof: Yes
Length: 290 mm
Weight: 645 g
Construction: Aluminium Alloy with Black Anodised Finish