This universal dimmer switch will dim any 12V DC, LED or incandescent fixture. Dims multiple lights on the same circuit, up to a 5 amp load. Unit will dim from 12 to 0 volts. Will not override pre-determined voltage levels on some LED lights, which may decrease dimming functionality. Internal fuse protection. Smooth incremental dimming stages create an even and pleasant light at any level. For interior use only. Dimmer can be reset by holding the switch in down position for 5 seconds.