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

R301T Capacitive Fingerprint Module
1 × 173 SAR
WeMos D1 ESP8266 Wifi Board
1 × 98 SAR
DFPlayer Mini MP3 Player Module For Arduino
1 × 92 SAR Subtotal: 363 SAR
R301T Capacitive Fingerprint Module
1 × 173 SAR
WeMos D1 ESP8266 Wifi Board
1 × 98 SAR
DFPlayer Mini MP3 Player Module For Arduino
1 × 92 SAR Subtotal: 363 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