Pi Zero WH is Pi Zero W with Headers.
Pi Zero WH features:
- BCM2835 (identical to Pi 1) but up by 1GHz, so 40% faster
- 512 MB of RAM
- Mini HDMI
- Micro USB On-The-Go port
- Micro-USB port for power supply
- 40-pin HAT compatible header
- Composite video and reset headers
- CSI camera connector
- 802.11b / g / n Wireless LAN
- Bluetooth 4.1
- Bluetooth Low Energy (BLE)