Candy Mini Boost Type Portable Speaker & Booster Cell Phone Dock Charm for iPhone 4 /4s (Black) Louder and more powerful sound! This cute little charm literally turns everything around you into a speaker! All you need to do is simply stick this onto ANYTHING (solid) and it will start playing music as a speaker. This newest candy music comes with a built-in booster, so you can hear your favourite music much louder and better quality The volume can be easily changed on the dock connector and it requires no batteries at all Peel off the sticker on the sticky sheet. Connect it to your iPhone 4 and iPhone 4s /iPod and stick it to anything you like.