Feature:* Support signal switch directly. Support USB, TF* Support ( EDR) (ar been paired with mobile phones can realize wirele music play)* Support USB / TF / /FM / LINE switch. MP3 / WMA, WAV lole music de .* Support USB / TF card switch, PREV, , fast forward, fast rewind, volume, EQ, play / pause, stop, single repeat, mute, shutdown and direct election.* Support Bluetoot PREV, , volume, EQ, play/pause, mute, turn it off.* Support16,32 file system. Support for MP1 Layer3, MP2 Layer3, MP3 Layer3 version of the song.Support 32-320 KBPS MP3 songs.* Support power off memory function: memory play songs and volume before power off.Note:Non-smart phones (android) have to enter the paword - 0000De board play mode instruction:De board in the absence of memory card or U disk,boot default to ''audio input'' mode,the screen display LINEPre ''MODE'' key on the panel or the e control switch to MODE,the screen shows ''BLUE'',can open search contion at this timePre ''MODE'' key on the panel or the e control switch to radio MODE,the screen display FM radio frequency,pre ''PLAY'' on automatic searching Pre ''MODE'' key on the panel or the e control switch to the U disk or memory card ''play MODE'',the screen displays the time schedule of the songThe e control instruction:1. POWER: STANDBY on cannot switch.2. MODE: TF card and U disk: switching sequence for USB→TF→→FM→AUX;Only U disk: switching sequence for USB→→FM→AUX;Only the TF card: switching sequence for TF→→FM→AUX;There is no USB and TF card: switching sequence for FM→AUX→.3. PREV: In USB/TF / MODE,short pre for PREV;In the USB / SD MODE, pre for fast rewind;In FM MODE, short pre for last , pre for scan search last .: In USB / TF/MODE,short pre for ;In USB / TF MODE,pre for fast forward;In FM MODE,short pre for ,pre for scan search the .4. VOL + : short / pre for music. VOL - : short/pre for music.5. REP:In USB / TF MODE,is the switch key between single repeat and whole cycle when play music,boot for all cycle.6. STOP: In the USB / TF MODE,short pre to STOP the music play.7. MUTE: MUTE,pre for MUTE,pre again for relieve(also can relieve by VOL- /VOL+).8. EQ: Acoustic field MODE.The NORMAL→BAS→POP→ROC→JAZZ→CLA→CUT→NORMAL9. PLAY/PAUSE: In USB/SD/MODE for PLAY / PAUSE;In the FM MODE,pre for searching all s and save.Specification:Installation pitch: 92 mm wideInstallation hole: 83 x 20 x 38 mmOverall dimensions: 107 x 25 x 38 nput voltage: 5-12VPackage Included:(Send without retail box)1 X de board1 X e controls (Not Bring the Battery)