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

Medium Kit for Arduino Projects 1 × 229SAR
keypad 4×4 1 × 23SAR
Prototype Shield for Arduino MEGA 1 × 35SARSubtotal: 287SAR
Medium Kit for Arduino Projects 1 × 229SAR
keypad 4×4 1 × 23SAR
Prototype Shield for Arduino MEGA 1 × 35SARSubtotal: 287SAR
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