The GlowSaver is just as the name implies. This protective case will keep your Garmin Astro 320/430 clean while keeping dirt/grime out of the buttons. Introduction to any light source will charge the glow in the dark material. Features a dirt resistant coating to help with the continuous use of dirty hands or gloves. Besides the high quality case provided we also include 2 screen protectors for your Astro 320/430. These cases can be used in conjunction with our nylon pouch or dash mount that is sold separately. Keep your Astro 320/430 clean and protected with the peace of mind of having a glow in the dark case. This is cheap insurance to help find your most used equipment in the woods while hunting.