Apple first announced the new MagSafe product line during its October event, but the Duo didn’t become available for purchase until earlier this month. As its name implies, the $129 model can charge two devices at once. It even works with the Apple Watch, unlike the solo MagSafe charger, which doesn’t. Since it doesn’t ship with a power adapter, you can use your own — unless it’s Apple’s 29W model, apparently. The company recommends compatible 20W adapters for wireless charging up to 11W, though, or 27W adapters for wireless charging up to 14W.