As reported by engadget,
You can now purchase Apple’s MagSafe Duo charger from the company’s store for $129. Apple announced the charger, which can charge two devices at once, and other MagSafe devices during its October event. A solo MagSafe charger has been available for quite a while — and it only costs $39 — but it doesn’t work with the Apple Watch. The Duo does, so you can simultaneously charge your iPhone and your Watch. Or any two compatible devices, really, which also includes the Wireless Charging Case for AirPods and other Qi-certified products.
While the device comes with a USB-C to Lightning Cable, it doesn’t ship with a USB—C power adapter. Apple recommends using a 20W power adapter for wireless charging up to 11W or a 27W adapter for wireless charging up to 14W. The lack of an adapter does’t really come as a surprise, seeing as the company’s other recent releases like the new Apple Watch and the iPhone 12 don’t ship with one either. Plus, Apple recently started selling a 20W adapter for $19.