Type:Portable Ultrasonic Diagnostic Devices Multiple language:YES Frequency Conversion:2.5MHz 3.0MHz 3.5MHz 4.0MHZ 5.0MHz Operation system:windows XP(Best) or windows 7 USB function:Yes Maximum Scanning Depth:max. 250mm probe connectors:2 external battery:YES 3D image function:YES ultrasound keyboard:Silica gel waterproof Ultrasound Box:YES