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

keypad 4*4 board (switch) push buttons 1 × 12SAR
Adapter 9v 2A for Arduino 1 × 29SARSubtotal: 41SAR
keypad 4*4 board (switch) push buttons 1 × 12SAR
Adapter 9v 2A for Arduino 1 × 29SARSubtotal: 41SAR
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