The Switchblade Systems SWBS-RP400 serves as a four-channel replay and slow-motion controller designed for vMix Replay. This sleek desktop unit features a T-bar for precise speed adjustments, a jog wheel for navigating the timeline, and various standard buttons for replay operations such as Clip In/Out, Play/Pause, dual rows of 1-4 Cam/Out, and four event shortcut buttons. It connects to a vMix host computer through USB, LAN, or an RS-232 serial cable.