Raspberry hardware
Now let's look at the electronic side.
Power
5V 2.5A DC via micro USB connector
The GPIO ports on a Raspberry Pi are rated for about 16 mA of current flow each, with a total of 40 mA across all GPIO ports combined. When designing circuits that interface with the GPIO ports, keep this limit in mind. Make sure you provide adequate current-limiting resistors to avoid damaging your Pi.
Processor
Broadcom BCM2837B0, Cortex-A53 64-bit SoC, 1.4 GHz with 1GB LPDDR2 SDRAM
Extended GPIO
Extended 40 pin GPIO port
HDMI
Full size HDMI
CSI Camera connector
CSI Camera Connector The Raspberry Pi camera module is capable of taking full HD 1080p photo and video and can be controlled programmatically.
The Camera Serial Interface (CSI) is a specification of the Mobile Industry Processor Interface (MIPI) Alliance. It defines an interface between a camera and a host processor. The latest active interface specification is CSI-3 which was released in 2012
Audio output
4 pole stereo output and video composite port
Ethernet
10/100 Ethernet port
USB 2.0
4 x USB 2.0 port and Faster Ethernet over USB 2.0
Wi-Fi and Bluetooth
Bluetooth 4.1 Wi-Fi