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

ESP8266 _ ESP-01 based on ESP8266 WiFi Module 1 × 35SAR
PBS-33B WATERPROOF PUSHBUTON SWITCH 12MM – Red 1 × 7SAR
DFPlayer Mini MP3 Player Module For Arduino 1 × 92SARSubtotal: 134SAR
ESP8266 _ ESP-01 based on ESP8266 WiFi Module 1 × 35SAR
PBS-33B WATERPROOF PUSHBUTON SWITCH 12MM – Red 1 × 7SAR
DFPlayer Mini MP3 Player Module For Arduino 1 × 92SARSubtotal: 134SAR
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