A:AnswerIt's not necessary. You can use any regular USB C to USB cable to charge it. However, it will take hours to charge using that method. With the Google 30W it takes about two hours to go from 25% to 100% on my Pixel 7.
A:AnswerIt works with the Pixel 7 Pro, so should work with 7 as well. Bought it same day as my 7 Pro and have been charging with it for 3 weeks. Matches with USB-C to C cable that comes with both phones.
A:AnswerIt needs a usb-c. Which is smaller than a USB. The item I got plugs directly into a wall outlet, and the Google pixel watch charger goes right in. If you want to charge to a USB (older connection) then no this is not your item.