The K3-2245S-K1 is a toggle switch with 9*3.5mm RoHS manufactured by HRO Parts. It is a single pole, double throw (SPDT) switch which has two poles and three terminals. This switch works like a light switch that toggles between two states, allowing the user to choose which state they want the switch to be in at any given time. The terminals are labeled COM, NC, and NO depending on the position of the switch. The RoHS certification means that the switch is compliant with EU environmental standards and contains no mercury, lead, cadmium, hexavalent chromium, or polybrominated biphenyls (PBB) or polybrominated diphenyl ethers (PBDE). The 9*3.5mm dimensions refers to the size of the switch profile, making this toggle switch suited for applications that have more limited space or require a slim design.