KMT2 Nano-Miniature SMT Top Actuated Switches C&K Switches KMT2 Nano-Miniature SMT Top Actuated Switches feature a small footprint, high number of cycles, and a small thickness with an integrated actuator. These halogen-free devices have a ground pin option. C&K KMT2 switches are ideal for mobile phones, hearing aids, MP3 accessories, and BLUETOOTH® headsets.