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

LC Meter
1 × 138 SAR
MEGA Board for Arduino Mega 2560 Projects
1 × 135 SAR
UNO Board SMD for Arduino UNO R3 projects
1 × 45 SAR Subtotal: 318 SAR
LC Meter
1 × 138 SAR
MEGA Board for Arduino Mega 2560 Projects
1 × 135 SAR
UNO Board SMD for Arduino UNO R3 projects
1 × 45 SAR Subtotal: 318 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