The Caldwell Flash Bang Target Hit Indicator brings new feedback to shooters when using steel targets. Flashing green LED lights are triggered by an impact on the target telling shooters of their hits at extremely long ranges where confirmed hits can be difficult. The self-contained unit features 10 ultra-bright green LED lights that are visible for thousands of yards, even in bright daylight conditions.Powered by 3 ""AA"" batteries (included), the Flash Bang has a battery life of over 30,000 impacts. The Flash Bang is compatible with targets over 5"" and attaches easily with heavy-duty hook and loop material.