Quantity   Component name
1 × Teensy 3.1 http://pjrc.com/teensy/teensy31.html
1 × Circuits@Home USB Host Shield for Arduino Pro Mini https://www.circuitsathome.com/products-page/arduino-shields/usb-host-shield-for-arduino-pro-mini
4 × Teensy-LC http://pjrc.com/teensy/teensyLC.html
1 × Targus USB 4 Port Hub generic USB 2.0