This set of five Atomos Master Caddy II units is compatible with the Shogun, Ninja V, and all earlier Atomos monitor/recorder models. The Master Caddy II supports standard 2.5" SSDs and HDDs and features dual-key insertion (groove/slit on both sides) in contrast to the original Master Caddy's single-key insertion. The Master Caddy II replaces the original Master Caddy as the standard caddy for all Atomos monitors/recorders. (The original Master Caddy is not compatible with the Shogun.)