1.This speaker has 4 modes: FM Radio Mode, TF card mode, USB disk mode, Line-in mode.
2.Press and Hold the Play/Stop button more than 2 seconds to switch Mode.
3.Press and Hold the back or forward button to adjust the volume.
1 x Speaker
1 x USB 2 in 1 line (charge+ audio) (NO Retail Box. Packed Safely in Bubble Bag)
Aribelly Wireless Speaker Portable Mini FM Radio USB Micro SD TF Card MP3 Player - B01MRY6HSF