LCD Display: 2.5?true color TFT LCD (Resolution: 480* 234) SD/MMC card: expansion card slot, support Max. 1 GB SD/MMC card Battery life: 3.5 hours video / 4 hours audio replay (1200mAh Lithium rechargeable battery) OS support: Windows XP / 2000 / 98 SE Dimension: 101mm* 69.5mm* 20mm Weight: 144g(with battery) 106g(no battery) Hold function: prevents accidental key actions Signal to noise ratio: 90db Frequency response: 20Hz to 20 khz Interface: USB 1.1 / AV in/ AV out/ earphone jack/ SD/ MMC card slot Operating system: Microsoft Windows 98SE,2000, XP, 2003(Driver installation required for Windows 98 SE ONLY) Support format: MP4/ MP3/ MTV/ ASF/ WMA/ etc. Built-in memory: 128 MB Hold feature: yes Power supply: built-in rechargeable lithium battery Color: black Warranty: 1 year limited manufacturer warranty