This is a nice and quite robust red dot sight w/ an integrated Picatinny interface, likewise w/ a cross bolt for a Picatinny slot, to negate recoil-induced movement. The reticle is a dot w/ 12 levels of brightness. It likewise features an auto-shutoff feature that de-activates your red dot after two hours.
The nice feature to this red dot, is that it uses 1x CR123 batteries, which are nice as you can chuck the rechargeable type in and never really have to worry about handling tiny, non-rechargeable coin cells - just be sure to buy a proper RCR123 battery;

• NITECORE RCR123 RECHARGEABLE 3.7V BATTERY 650MAH

Otherwise, this red dot is chunky and has a decent quality feel to it. The shape and design replicates the LEUPOLD LCO (Leupold Carbine Optic). 
The objective is a rectangular 25x35mm, w/ the long side being horizontal.

This nifty red dot is supplied in a very sturdy hardshell case - the clip snaps shut positively. 

LCO Red Dot Sight Replica

A solid red dot sight by Aim-O made entirely of metal, which provides it with high durability and resistance to outside factors. Thanks to a RIS / Picatinny mount, the sight can be attached to any replica with a standard RIS 22 mm rail.

Features:

- dot in red and green color
- adjustable dot brightness
- metal casing
- integrated RIS / Picatinny mount
- vertical and horizontal adjustment
- power source: 1 x CR123A battery (not included in the set)

The set includes:

- red dot sight
- cleaning cloth
- adjustment tool