... speakersHeadset Interface3.5MM standard headphone jack (can be audio input)SD card interfaceSD / MMC Card slot, support 2GB maximumVideo input interfaceCVBS video inputHard ... ,4000mAHworking time 4-5H)sofrwareOperating systemWindow CE 5.0Upgrade waySD CARD upgradelanguagechinese and english Office(all set)Excel,Word,pdf,PowerPoint ...