All of Skandvik's LED Replacement Bulbs come in retail packageing (clamshell with informational insert). Unless specified, all LED bulbs are 10-30 volts DC, meaning they work with 12 & 24 volt charging systems. You will find all of the most popular base types: G4, Bayonet, (BA15d - BAY15d - BA15s), Fastoon, Wedge, and MR 16 style. Socket adapters are also available to conert your bayonete sockets to a G4 socket, which provides a larger selection of LED Replacement Bulbs. Scandvik uses the newest LED technology which means brighter and more efficient LED products - equating to low mp draw and low operating temperature.