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 × 229 SAR
Data Logging Shield SD card shield XD_204
1 × 68 SAR Subtotal: 297 SAR
Medium Kit for Arduino Projects
1 × 229 SAR
Data Logging Shield SD card shield XD_204
1 × 68 SAR Subtotal: 297 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