The Holosun SCS (Solar Charging Sight) is a direct-attachment optic designed exclusively for full-sized Glock MOS pistols, combining simple solar charging and multi-reticle versatility in Holosun's lowest-profile pistol optic for use with standard-height iron sights. The SCS reimagines Holosun's proven Solar FailsafeTM system as a primary power source, so you never need to mess with batteries or wall charging. Simply expose the unit to occasional bright light, and the SCS will recharge itself.