Model Number: JK6839BT Memory Size: USB/SD Screen: No Battery Life: > 20 hours Style: Card Function: Bluetooth, FM Radio, USB/SD-MP3/FM/Bluetooth Color: Black Place of Origin: Guangdong, China (Mainland) Product type: MP3 decoder board Application: Pro audio, Amplifier,Speaker,car audio... Format: MP3 Memory: USB/SD Support: IR remote control Panel color: Black Panel size: 105*25.5mm Voltage: 5V JK6839BT Programmable bluetooth audio sd card fm tuner mp3 player module 1,Programmable bluetooth audio sd card fm tuner mp3 player module Functions USB/SD/MP3/Line in (AUX)/FM/Bluetooth MP3 decorder support 32â??320kbps FAT16 or FAT32 systems supported 4 Keys: MODE, NEXT/V+, PLAY/PAUSE/SCAN, PRE/V- With Remote control 2, Keys function: MODE: USB/SD/AUX/FM/Bluetooth switch. NEXT/V+: Under MP3 mode, short press NEXT, long press VOL+. Under AUX mode, press VOL+. Under FM mode, short press to selection up, long press VOL+. Under bluetooth mode, press VOL+. PLAY/PAUSE:Under MP3 mode, short press PLAY/PAUSE, long press STOP.. Under AUX mode, press play/mute. Under FM mode, short press to automatic selection. Under bluetooth mode, press play/mute. PRE/V-: Under MP3 mode, short press LAST, long press VOL-. Under AUX mode, press VOL- Under FM mode, short press to selection down, long press VOL-. Under bluetooth mode, press VOL-. 3, Power supply DC5V 4, Remote Control--- Keys function Power :ON/OFF (standby) Mode : Same function with Long press Play/Pause button on pannel for switch the working Mode PREV: For Previous song in USB/SD state NEXT: For Next song in USB/SD state VOL+ : Volume up VOL-: Volume down RPT: For switching one song repeat or all song repeat in USB/SD state, default is all song repeat . U/SD: Switch USB/SD /FM scan. MUTE: First press mute , press again will release from mute. EQ : NORMAL/JAZZ/ROCK/POP/CLASSIC/COUN PLAY/PAUSE : For play and pause in USB/SD state. Button 0-9 : Select song in USB/SD state, if the song number over 9 , just input the numbers in series . 5,Panel dimension :105*25.5mm Why choose us? About us: Shenzhen J&K Ideal Electronic Technology Co., Ltd. is a professional manufacturer and is devoted to the integrated business modes of R&D, manufacturing, sales and services. Our main product series includes USB, SD MP3/MP5 module, amplifier module, wireless module, etc. With a powerful R&D team, good quality, competitive price and unique design, we will present more advanced professional technology and sincere service for customers. Welcome to visit our company for business discussion at any time at your convenience. Our products are expanding very fast and well be accepted by consumers all over the world.