A Raspberry PI 400 is a US layout Keyboard with a built in Raspberry PI 4 CPU.
It has:
a USB C power input,
2 Micro HDMI ports,
2 USB 3 ports,
a USB A port,
an Ethernet RJ45 port,
WiFi 2 & 5GB
BlueTooth
a Micro SD slot for main memory,
and a GPIO connector as on all Raspberry PIs.
This kit includes the keyboard with built in CPU, power supply, mouse, Micro HDMI to HDMI cable and a 32GB MicroSD card with Linux OS, Raspian latest version installed.