ZB HPG 425BT connections and buttons Charging Jack DC In, USB-to-Micro USE cable Included 2. AUX-In / antenna-in 3,5mm Jack connector, cable Included Use with provided audio cable as FM antenna 3. ON/OFF button 4, Play/pause 5. Previous / Volumes down previous track or esp pressed to decrease volume Next / Volume down next track or esp pressed to Increase volume 7. Mode switch between Bluetooth, USB, SD, FM and AUX-In 8. LED Indicator 9. Micro SD Slot For standard Micro SD card, up to 3268 10.