Features: 1) As a portable disk 2) MP3 player 3) 3-10 ATM water-resistant 4) Red/green light indicator 5) 10 hours playing for fully charged batteries 6) Memory: built-in 128/256/512MB Sumsung original flash chip 7) Supporting systems: Windows 98/SE/ or above 8) Interface: round 4 pins USB 9) Battery: built-in 150mAh, 3.7V Hi Li-ion rechargeable battery 10) Charging time: up to 2.5-3 hours and up to 5-6 hours for first-time charging 11) Battery use: up to 10 hours for continuous playing 12) Weight: 50-80g 13) Speed: USB 1.1 (max. 5Mbps) 14) Supporting bit rate: 32kbps-256kbps 15) Temperature: -20 - +70oC 16) Output: 5mW + 5mW 17) Frequency rate: 20Hz-20kHz 18) Accessories: MP3 QA watch user manual, 4 pins minimum USB port, stereo earphones, CD driver