The Raspberry Pi Zero WH is the smallest member of the Raspberry Pi family but still packs a LOT of features including WiFi, Bluetooth, mini-HDMI, a micro-USB port and camera connector.
The Zero WH features a 1GHz processor (BCM2835) and 512MB RAM .
 
The familiar 40-pin GPIO header from the larger Raspberry Pis is included (soldered in place for you)
 
Raspberry Pi Zero WH (with pre-soldered header) Details:
BCM2835 (same as Pi 1) but up-clocked to 1GHz, so 40% faster
512MB RAM
Mini HDMI
USB On-The-Go port
Micro USB power
HAT-compatible 40-pin header pre-soldered
Composite video and reset headers
CSI camera connector
802.11b/g/n Wireless LAN
Bluetooth 4.1
Bluetooth Low Energy (BLE)