Mp3 player 10M31 Feature: Item:10M31 Capacity: 512MB/-32GB Dimensions 44x29.5x13.2(mm) Warranty: 5years Delivery time: 1-2 working days. Portable MP3 player. System Requirements: Hardware IBM PC or compatible PC, Notebook or Macintosh with USB port Operation System Windows ME/98/2000/XP/Vista and Linux2.4/Mac OS9.0 above. Function characteristics: USB Interface USB2.0 high speed Capacity 128MB ,256M,512M,1GB,2GB,4GB,8G(Optional) Storage Device Removable Storage Device EQ Mode N/A Play Mode Repeat all VBR Available. Technical Specification: Read speed SLC5.5 ~ 6.0 MB/S MLC3.5~4.5MB/S Write speed SLC3.5 ~ 4.0MB/S MLC2.0~3.0MB/S Audio format MP3,WMA Bit Rate MP3:8Kbps320Kbps ,WMA:8-384 Kbps Battery Life About 5~7Hours LCD Display N/A SNR >85dB Frequency Response Range 20HZ~20KHZ. Physical characteristics : Battery Type Rechargeable lithium-ion polymer battery Storage Temp* -20 ~ +55 Ambient Temp* -10 ~ +55 Operation Relative Humidity* 20% ~ 90%(40C) Storage Relative Humidity* 20% ~ 93%(40C) Sizemm L*W*H : 44x29.5x13.2(mm) Weight About 18.2g Color green/red/silver/black and so on. Package Blister package/gift box.