Click on PDF links below for more information Flashering Bells PDF Replacement Bulbs   Single Stroke bells produce one strike (tone) when power is applied and will not repeat until power is removed and then re-applied. The W.L. Jenkins line of single stroke bells include indoor Pig-Tail and Plug-In types, in AC and DC voltages. The W.L. Jenkins Company has combined the unmistakable audio impact of a bell with the added visual impact of flashing light. The light flashes about 100 times per minute while the vibrating bell rings continuously so the unit provides both an audio and a visual warning. Flashering Bells are available as a continuously ringing bell or as a single-stroke ring bell.