PR9 Standard Flashlight PR Replacement Light Bulb: Description - Standard replacement flashlight bulb - 2.70 Volt - 0.15 Amp - B-3-1/2 Single Contact Miniature Flanged Base (P13.5S) - C-2R Filament Design - 0.25 MSCP. - 45 Average Rated Hours - 1.25" Maximum Overall Length - 0.45" Maximum Overall Diameter - Typically found in flashlights using two "D" cell batteries.PR9 Standard Flashlight PR Replacement Light Bulb