The Teenage Engineering PO-33 KO is a highly portable, pocket-sized hardware sampler and sequencer that features a built-in microphone and 40 seconds of sample memory for creating music on the go. It allows users to sample any sound source and arrange it into melodies or drums using an integrated 16-step sequencer, while also offering 16 built-in effects and the ability to link up to 16 patterns for more complex arrangements.