An accessory for a hand-held video game device having an external power supply outlet and a headphone outlet, including a case capable of forming a mechanical connection with the hand-held device, a rechargeable battery, a power jack electrically coupled to the rechargeable battery and adapted for insertion into the external power supply of the hand-held device for powering the device, an audio connector jack adapted for insertion into the headphone outlet of the hand-held device for receiving audio signals from the hand-held device, an amplified stereo speaker system adapted to be powered by the rechargeable battery and receive audio signals from the hand-held device through the audio connector jack when the audio connector jack is inserted into the headphone outlet, and a vibration mechanism electrically coupled to the rechargeable battery and adapted to cause movement sensations in the accessory, the vibration mechanism adapted to be actuated by the audio signals.