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

RELAY 24V 16A 8 PIN
1 × 23 SAR
Relay HF32F 125VAC 10A- 4 PIN
1 × 7 SAR
IRF3205 MOSFET Transistor
1 × 12 SAR
IRF540 N-Channel MOSFET Transistor 20A
1 × 9 SAR
Arduino Nano Board
1 × 55 SAR
BlueTooth Module HC-06
1 × 45 SAR Subtotal: 151 SAR
RELAY 24V 16A 8 PIN
1 × 23 SAR
Relay HF32F 125VAC 10A- 4 PIN
1 × 7 SAR
IRF3205 MOSFET Transistor
1 × 12 SAR
IRF540 N-Channel MOSFET Transistor 20A
1 × 9 SAR
Arduino Nano Board
1 × 55 SAR
BlueTooth Module HC-06
1 × 45 SAR Subtotal: 151 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