The new HS407C 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 Holosuns innovative Solar Fail-safe back up. The HS407C will run up to 10 years on a single battery on setting 6. It comes equipped with Holosun's Shake Awake technology with last setting recall. This optic has our features in one tough, small package.