This can include everything from keyboards, mice, external hard drives, printers, all-in-one printer/scanner/copiers, projectors, and any other devices that are sold exclusively for external use with a computer and provide input or output from a computer. So basically, if it plugs into your computer or is otherwise attached to your computer either through a plug or wireless connection, it’s a peripheral. Many peripheral items cannot be accepted by the Colorado Springs transfer stations and/or landfills due to their hazardous waste content, and recycling efforts are required.