The SP-404 is a portable sampler and sequencer developed by Roland, designed for music production and live performance. It features a user-friendly interface with 16 velocity-sensitive pads, allowing users to trigger samples and create beats easily. The device includes various effects and a built-in microphone for recording sounds on the go. This sampler is popular among hip-hop producers and electronic music artists due to its compact size and versatility. The SP-404 can store multiple samples and offers real-time manipulation, making it a valuable tool for both studio work and live shows.