100% and high quality Waterproof MP3 player & earphone designed for swimming‎,‎ spa and water sports High durability aluminum casing with anti‎-scratch USB Plug & Play Stylish design with fluorescent holders to strap onto swimmer Compliant with international IPx8 water resistance standard Memory size‎:‎ 4G Audio format‎:‎ MP3‎,‎ WMA Compliant with high speed USB 2.0 specification Compliant with Windows 98/ME/2000/XP‎,‎ no driver is needed MP3 type‎:‎ USB flash disk Master‎:‎ 7107 optional Built‎-in battery‎,‎ capacity of 160 mA for playing 7‎-9 hours Apply for FLASH type‎,‎ compatible with 34nM ‎(‎MLC‎)‎ Support FM function ‎(‎You are suggested to adjust the volume of the player to suit yourself before using the FM function since you cannot adjust when using the function‎.‎‎)‎ Maximum output power‎:‎ 5mW ‎(‎32‎)‎ Frequency response range‎:‎ 20Hz ‎- 20KHZ Signal‎-to‎-Noise‎-Ratio‎:‎ 90dB Color‎:‎ Red Dimension‎:‎ Approx‎.‎ 6x2cm‎(‎LxD‎)‎