The Rumble Pak is the first home video-game controller accessory to create a physical sensation that complements the on-screen action. When connected to the Nintendo 64 Controller, the Rumble Pak creates different degrees of vibrations, depending on the actions on-screen. The unit vibration increases when a large explosion is experienced, e.g., after defeating a level boss.

The Rumble Pak unit contains a small, vibrating motor, similar to those used in pagers. When the on-screen action heats up, the N64 sends signals to the Rumble Pak, activating the motor according to the action's intensity.

Powered by two AAA batteries (included), the unit delivers approximately 50-60 hours of rumbling action.