The HE403GL-GR Elite the new green reticle version of the extremely popular Classic HS403GL. It is a small compact red dot sight with side battery housing and H/L adjusting turret options. Employing Holosun’s LED technology, the lifetime for one CR2032 battery can be up to 5 years. Holosun’s – Shake Awake – technology automatically turns the optic on at the slightest movement. When the optic senses no movement, it will go to sleep.