The new HS507C Micro Red Dot System from Holosun is a pistol-sized optic with an open frame for a great sight picture, clear glass and a rugged 7075 aluminum housing. It is powered by a CR2032 battery and Holosun's innovative Solar Fail-safe back up. Featuring our Multi-reticle system, the HS507C allows the operator to switch the reticle between a 32 MOA circle with 2 MOA dot, a 2 MOA dot only, or a 32 MOA ring only, all at the push of a button. Better yet, the same LED projects all three reticles, so no re-zeroing is necessary. It comes equipped with Holosun's Shake Awake technology with last setting recall. This optic has our features in one tough, small package. Features; Parallax free optical design, with unlimited eye relief; Multi-reticle System; Shake Awake technology with last setting recall; Solar cell and high capacity battery provide dual power supplies; Industry standard footprint for your pistol mounting needs; CNC machined with 7075 aluminum housing.