sThe PER-04 is a plug-in rotary encoder manufactured by SM Switchs that complies with RoHS, or Restriction of Hazardous Substances, guidelines. The PER-04 is an industrial-grade encoder that features two channels, allowing users to rotate two separate components independently. The PER-04 is resistant to shock and vibration, making it an ideal choice for harsh industrial applications. It also has an electrical life of more than 200,000 cycles, so it can be used reliably and consistently over long periods of time. In addition, the encoder features a high-phthalate plastic body that has superior resistance to oil, chemicals and solvents.