Feature: -15 inch TFT screen -Pretty and light -Full digital imaging technology, crystal-clear Image -Can work with backfat probe -Low power consumption -8G Large volume storage image -Built-in battery -Solid shell and structure -High Cost-effective Specifications: Display size: 15 inch TFT Scanning manner: Electronic convex array, electronic linear array Working frequency: 2.0MHz~10MHz Display mode: B, B+B, B+M, M, 4B Scanning range: Convex array 60°~150° Amplification factor?1.0, 1.2, 1.5,2.0 Gain control: 8 segments TGC and overall gain can be adjusted respectively Image processing: 8 ? corrections, frame correlation, point correlation, line correlation, digital filtering, digital edge enhancement and pseudo color processing, etc Image gray-scale: 256 levels Scanning line number: 512 lines/frame Frame rate: 30 frames/second Digital scanning conversion: 512×512×8 bits Memory capacity: ?2GB Conventional measurements: distance, perimeter, area, volume Obstetric measurement: gestational weeks (BPD, GS, CRL, FL, HL, OFD, TTD, AC), expected date of confinement and fetus weight, etc. Report function: auto make report Battery capacity: 3000mAH/7.4V,can work more than 2 hours Display screen: 15" TFT Output interface: USB port, video. Overall size: 362mm×340mm×60mm Total weight: 4Kg(with battery)