Battery or solar. Red Dot, MOA Circle or both. The choice is yours, as long as your choice is a Holosun HS510C Reflex Sight. The parallax-free sight picture employs new LED technology to squeeze up to 50,000 hours of life from a single battery. Even better, Solar Failsafe keeps your optic operating off of available ambient light, so battery failure is not an option. Innovative Shake Awake technology brings the optic to life with the slightest movement, and once "awake," the HS510C provides your choice of 2 MOA Red Dot, 65 MOA Circle, or both at the same time. Durable CNC-machined 6061-T6 aluminum construction and industry-standard footprint mount creates a rock-solid connection to your firearm. Multiple Reticle System (MRS) gives you the choice of 2 MOA Dot, 65 MOA Circle, or both Solar Failsafe uses ambient light to power your optic even when your battery has failed Advanced LED technology gives you up to 50,000 hours of use on a single battery Parallax-free sight picture with unlimited eye relief Shake Awake technology powers up at the slightest movement Easy to operate push-button brightness adjustment 6061-T6 Aluminum construction with titanium-alloyed hood Quick-detach mount makes a rock-solid connection to your firearm Order today!