The new HE407C-GR X2 Micro Green 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. The HS407C will run up to 10 years with a single battery on setting 6. It comes with Holosun's Shake Awake technology with last setting recall. When the optic senses no movement in 10 minutes (adjustable by user), it will go to sleep. In the sleep mode, Holosun’s “Shake Awake” technology automatically turns the optic on at the slightest movement.