Package Included: 1 pack of Gateron SMD switches 3 pin%ocs%This switch can support both normal RGB and underglow SMD%ocs%This switch can’t interchange with hotswap keyboard which uses outemu switch initially%ocs%This Gateron yellow is linear switch which is most cost effective among all linear switches.%ocs%This switch can’t use for optical keyboard,such as SK61 SK64 etc.It can only used on classic mechanical keyboard