Specifications: Rated input: 5V/500MA Power supply type: Direct current (DC) 3.7~5V power supply Appearance nice size: 88(L)*25(H)mm Rated power consumption: USB playback current <120M Other status: <80MA Panel interface: USB, AUX Operating temperature: -20℃~60℃ Output amplitude: >600MV Keys Usage: Short press: previous song Short press: play/stop Short press: next song Long press: volume up Long press: mode switch Double-click: TWS pairing Long press: volume down Key Function: POWER: STANDBY ON/OFF MODE: press this key to cycle selection input USB→SD→BLUE→FM→LINE PREV: In the USB/SD/BT playback state, short press to select the previous song, and long press to rewind (BT is invalid). In the FM state, short press to select the previous station and long press to search backward Radio (AUX status is invalid). NEXT: In the USB/SD/BT playback state, short press to select the next song and long press to fast forward (BT is invalid) in receiving In the FM state, the short press to select the next station Radio (AUX status is invalid) VOL+: Increase the volume VOL-: Volume down REP: Enter the loop mode during USB/SD playback, short press the loop button and enter A (full loop) →O (single loop) → FOLDER (current folder loop) → Random (random play) → NORMAL (cancel loop function and enter sequence playback) STOP: Stop playing in the USB/SD card state and press the play button to start playing from the first song (other states are invalid) MUTE: press mute in all states and press again to unmute EQ: USB/SD state is sound field mode. NORMAL→BASS→ ROCKPOP→ROCK→JAZZ→ CLASSIC→CUR PLAY PAUSE: In the USB/SD/BT playback state, short press once to pause and press again to play In the radio mode, press this button to enter the automatic search station 0~9: Directly select more than 10 numbers on USB/SD and input the number to be selected. In FM state Select a stored radio station in the mode, or press the number keys to directly enter the radio frequency to play the radio station Package Included: 1 x Bluetooth Decoder 1 x Remote Control (without battery)