Complex says: Gazelle works like any usual gadget trade-in service: You submit your gadget, and they evaluate it and send you the quoted amount. However, there's more to it than that. If you want, you can have the money sent to the charity of your choice—or, if you're really feeling philanthropic, Gazelle can work with you to set up a "Gadget Drive" wherein you solicit people's old gadgets, which then get turned into Gazelle. The money raised can be sent to whichever charity you choose. Ain't that sweet?