Zero W is the Smallest in Raspberry pi Family with inbuilt WiFi and Bluetooth.

It provides great connectivity with 2 Micro USB Ports(1 port for Power and other for USB Connectivity), 1 mini HDMI Port and 1 Micro SD Car Slot and has 512MB of RAM.

It has same Processor as Pi 1 i.e Broadcom BCM2835 processor with clock speed is 1 GHz ..

Specifications:-

• Broadcom BCM2835 1GHz processor

• 512MB RAM 

• Mini HDMI and USB On-The-Go port 

• Micro USB power 

• HAT-compatible 40-pin header 

• Composite video and reset headers 

• CSI camera connector 

• 802.11b/g/n Wireless LAN 

• Bluetooth 4.1 

• Bluetooth Low Energy (BLE)