See this at: wiirockband.net| Added on 11/25/08

Rock Band includes a wireless guitar, drum kit, and microphone. The game supports a second guitar for bass parts, but you’ll have to purchase it separately. To use all four instruments at once you’ll need to plug the included USB adapter into the Wii... See more

Rock Band includes a wireless guitar, drum kit, and microphone. The game supports a second guitar for bass parts, but you’ll have to purchase it separately. To use all four instruments at once you’ll need to plug the included USB adapter into the Wii and then hook the instruments and wireless dongles into the adapter. See less