Amazon has opened pre-orders for the 8Bitdo SN30 Pro Xbox Cloud Gaming Controller. The gamepad is designed for Android and comes with a clip to hold your smartphone (recommend size is between 49 mm and 86 mm). If you are interested, you can pre-order with the following link from the online retailer:
The gamepad uses Bluetooth connectivity. Its rechargeable battery is expected to last up to 18 hours per full charge. According to the product page, the controller will be coming out on Sept. 21, 2020, in the U.S. region.
For the uninformed, Xbox Cloud is a service that lets you stream videogames on supported devices.