The simplicity and fun of an old-school Casio keyboard meet true professional performance in Teenage Engineering's OP-1 Field Synthesizer. This all-in-one machine serves as a synthesizer, sampler, and controller, with 12 built-in synthesizer engines, multiple effects, four endless encoders, an FM radio(and transmitter), a built-in four-track recorder, and a four-channel mixer. The color-coded interface is surprisingly easy to use, in part thanks to the super AMOLED display, and the built-in USB-C port supports charging of the 24-hour battery, using the device as a MIDI controller, and simple drag-and-drop access to its built-in storage.