Imtra ILPB22243109 Lighting Leer LED Adjustable Downlight Gold 10 30VDC Warm White Master (Dimmable) IP20 EPAOEMFM3 Two year limited warranty Two year limited warranty Their precision design provides the optimum number of ball bearings for minimum friction while weight reduction is achieved through the use of fiber reinforced composites in the block head The "master" may be combined with up to 15 "slave" models (see ILPB22223109) allowing the entire group to be turned on off and dimmed simultaneously This "master" model features a very small momentary dimmer switch in the center of the lens so it can be controlled right at the light without the need for installing a separate dimmer and switch