1）MP3 PLAYER+USB FLASH DISK+CARD READER 2）SNR : 》90Db 3） Output power of the earphone : 32Ω Impedance is 5mV 4）Output the frequency range : 20HZ-22KHZ 5） Form of the music : MP3 6）USB2.0 complaint with full speed data transfer 7）USB bus powered capability 8) Support MMC/SD card memory 9) Build-in lithium battery 10) Mp3 format: Mpeg1.0 layer 3 support 11) Volume up/down control 12) Prev/Next song select 13) Size: L41*W41*H13.5mm 14) Wight (without battery and SD card): 30g 15) Support driver for Windows 98/98se/ME/2000/XP/2003 16) Support MAC OS 8.6, 9.x, 10.x 17) Support Linux kernel 2.4 later Package Parameter: 1) Giftbox size: 150mmx130mmx50mm 2) Carton size: 540mmx310mmx275mm 3) Packing: 40pcs/ctn 4) N.W.: 8.80kgs/ctn 5) G.W.: 9.60kgs/ctn