This is a panel mount toggle switch manufactured by HRO parts. It is 3.5mm wide, 13mm long, and complies with the European Union's Restriction of Hazardous Substances (RoHS) directive. It has a part number of K3-2346D-K1. This switch is housed in plastic with a round black cap and is double pole double throw (DPDT). It is rated for a maximum of 5A 250VAC.