Starbucks plans to roll out wireless smartphone chargers across its U.S. stores, the company shared yesterday.

But what looks like an incredible convenience for smartphone touting Iced White Chocolate Mocha drinkers is actually just an ad for PowermatDuracell, and the firms’ Power Matters Alliance.

Although the move was hailed by many [below] as a major convenience to smartphone users, most smartphones are not compatible with Powermat’s charging tech — and it’s quite possible that most smartphones will never be compatible, if another competing standard wins enough support. For the time being, if you’d like to take advantage of Starbucks’ wireless charging capabilities, you’ll have to shell out $30 for a goofy case. Or a $10 keyring, as one Twitter user points out.

You'll Soon Be Able To Charge Your Phone Wirelessly At Starbucks