Raspberry Pi 4

At first glance, the Raspberry Pi 4 board looks very similar to our previous $35 products, all the way back to 2014’s Raspberry Pi 1B+. If you’d like to re-use a Raspberry Pi 3 Official Power Supply, our resellers are offering a $1 adapter which converts from USB micro-B to USB-C. This time round, particular credit is due to James Adams, who designed the board itself (you’ll find his signature under the USB 3.0 socket); to Mike Buffham, who ran the commercial operation, working with suppliers, licensees, and resellers to bring our most complicated product yet to market; and to all those at Raspberry Pi and Broadcom who have worked tirelessly to make this product a reality over the last few years.

Source: www.raspberrypi.org