Truly tiny, compact, weatherproof, machined aluminum light, Features a 100,000 hour lifetime LED that never needs replaced, Run time of up to 8 hours, Rotating ""on-off"" switching, Non-rotating snap hook for easy one handed operation when attached to a keychain, For every Blue Nano Light sold, Streamlight will donate $1 to Concerns of Police Survivors, Inc, (C, O, P, S, ), Includes (4) LR41 alkaline button cell batteries 1, 47"" L, , 36 oz, Blue color easy to distinguish among tools, Non-rotating snap hook for easy one-handed operation, Rotating head ""on-off"", Runs 8 hours using four IEC-LR41 coin cells, SKU: ISN15774