USB shield – usb host shield
if you will not use External Power please be sure this jumpers are soldered as below :

so after soldering it will be like this image

Prototype Shield for Arduino MEGA
1 × 35 SAR
Resistor 82 ohm_1/4W
1 × 1 SAR
Potentiometer POT 5K variable resistor
1 × 6 SAR
power supply for bread board 5v,3.3v
1 × 18 SAR Subtotal: 60 SAR
Prototype Shield for Arduino MEGA
1 × 35 SAR
Resistor 82 ohm_1/4W
1 × 1 SAR
Potentiometer POT 5K variable resistor
1 × 6 SAR
power supply for bread board 5v,3.3v
1 × 18 SAR Subtotal: 60 SAR
if you will not use External Power please be sure this jumpers are soldered as below :

so after soldering it will be like this image

All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components
All Electronics Components