Holosun Technologies has added an optional solar powered failsafe on some of their sights. Their products already have an impressive 50,000-hour battery life, but the backup energy source will make sure that no matter what, you're covered. Peace of mind is achievable Whether you're a hunter who can't miss their one shot, a soldier or officer who can't put combat on hold to change batteries, or the average citizen preparing for a situation where batteries may become scarce.