C&K offers a number of options for display switches on heat cost allocators used in multi-unit dwellings. The KSC and KSE series are both sealed to IP67 to withstand harsh environments for many years. Both come in 6 mm x 6 mm packages with a number of actuator heights and the ability to customize the haptics. The KMR2 comes in a 4.2 mm x 2.8 mm footprint with up to 300 K cycle life. If cycle life and high temperature performance are not needed, C&K offers lower cost options such as the PTS645 and PTS647. If tamper detection is required, the HDT and HDS are commonly used. The HDT has a pre-travel of 0.3 mm and over-travel of 1 mm and the HDS has a pre-travel of 0.17 mm and over-travel of 0.5 mm. Both have low actuation forces of under 35 grams.