Velocity Airsoft VA11 Two-Way Adjustable QAE Airsoft Gun Red Dot Scope, Perfect for Any Airsoft Gun Features: Manufactured by Velocity Airsoft! Quick Aim Electronic Scope (QAE) Two-Way Adjustable for Elevation & Wind Optimization, Integrated Gun Rail Mount Requires CR2025 3V Lithium Battery to run (Included) Will Fit Most Airsoft Pistols and Rifles with a Standard 20mm Rail!