Sky-Watcher lets you preserve your night sight with this voltage regulated LED Red Light, flashlight. Since it’s dark when you’re out looking at the night sky, fiddling around with cameras, equipment, and star maps can be difficult. Using white light ruins your night sight and your ability to fully enjoy observing the night sky. Worse, if you’re operating near other amateur astronomers, who need their night vision, your popularity will quickly diminish. The LED Red Light emits soft, red light so you can keep do what you need to do, without continually losing your night vision anytime you need a bit of light. This special flashlight has adjustable brightness and uses a 9-volt battery, providing up to 625 hours of operation (depending on battery quality and charge). Battery not included.