Brand new Vibration/Rumble Pack for DreamCast, these are sometimes known as 'Puru Puru' packs.
3rd party product, which means it's not made by Sega.

Simply plug into your joypad or light gun, & feel the controller shake during certain game events(eg: when hit in a fighting game)

Vibration packs plug into the same sockets as VMUs, memory cards. Most(all?) controllers have 2 sockets, so can plug in VMU or memory card at the same time as this pack.

Is compatible with all games that support 'Vibration Pack' (is written on the back of the game cases). Most games I've seen support vibration.

Controller shown in photo is not included, price is for rumble pack only.