Features: and high quality. Three vibration modes:standard rumble, heavy rumble and rumble off. Custom sensitivity for enhanced game control and comfort. Additional power supply can replace the battery at any time. Introduction: The Rumble Pak is a removable device from for Nintendo 64 consoles which provides force feedback while playing video games. Games that support the Rumble Pak cause it to vibrate in select situations, such as when firing a weapon or receiving damage, to immerse the player in the game. Material: Plastic+hardware colour: grey Package Contents: 2 x Rumble Pak The product may have color difference due to different batches Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.