---
description: >-
  The Mark II has several hardware features that allow for customization,
  upgradeability and repairability.
---

# Hardware Features

* The 10 pin adapter on the rear of your Mark II provides easy access to the Raspberry Pi GPIO pins 1, 7, 14, 15, as well as the I2C bus on GPIO 2 & 3. There is also a ground, a +3V3, and two +5V pins. The connector is pin compatible with Raspberry Pi extension modules using I2C or UART. We’re excited to see what the community comes up with for innovative uses of this port.
* Replaceable Raspberry Pi - upgrade to 4gb or 8gb if you swap out the raspberry pi
* 2 x USB 3.0 and 2 x USB 2.0 ports.&#x20;
* The SJ201 is the only voice development board that includes Audio input DSP, LEDs, buttons, and high end amplified audio output for the Raspberry Pi. This makes it the most customizable Voice Assistant hardware platform that is ready to use out of the box.
* Hackable mounting holes on the back of the Mark II can be used for modification. Designed to accept the popular M2.5 sized screw, these holes can be used to extend the audio port, or make your Mark II the head of a robot!
* The Mark II is designed to be disassembled with just a phillips #1 (ph1) screwdriver. A long reach version is required 4” (100 mm) to reach some screws.
* We strived not to use any permanent bonding adhesives that would make it difficult to repair. There is hot glue between the two halves of the Audio Chamber. Hot glue is also used to create a seal where the wires pass through the Audio Chamber.  In both cases the Hot glue can be removed and reapplied or repaired.
* The Mark II can be modified to use a Real Time Clock
* The Mark II can be upgraded to output via HDMI
