feature - the smallest rechargeable mp3 player watch in the world - exact timer, portable and use friendly - nanophase materials, 3-10atm waterproof - 10~12 hours continuous playing when full charged - powerful earphone output, much loud voice - support mp3 format, usb memory disk, store the file as you like - dual charging methods: usb cable or ac adapter - shockproof without sound jumping - red/green/yellow led light indicator specification - surface color: black / sapphire - voice repeat: a/b - waterproof: 3~10 atm - indicator light: yellow/red/green - equalizer mode: 5 eq modes - watch machine: citizen - memory chip: samsung original 128/256mb flash chip - battery: 150mah, 3.7v hi li-ion rechargeable battery - operating system: windows 98/me/nt/2000/xp/mac 8.6 or above - file type: mp3(mpeg1/2, layer3), flash disk - time charge: up to 1.5~2 hours - time playing: 10~12 hours continue playing - interface: round 4 pins usb - bit rate: support 32kbps-256kbps - n/s ratio: approx 90db - usb: usb1.1 (max 5mbps) - temperature: -20 ~ +70 centigrade - frequency rate: 20hz~20khz - out put: 8mw+8mw - n.w: 50-80g - g.w: 500-700g