CS -ii type train velocimeter: 1:Outlook size: 290 x 255 x 100 mm 2:speed range: 4, 200 km/h ... carefully reading instruction.Technical parameters:1, speed range: 4, 200 km/h2, speed measuring precision: acuities plus or minus 1.5% v3, working ... rechargeable)Six, two sensor installation center distance: 400 mm ± 1 mm7, print speed: 128 Chinese characters per minute8, liquid crystal display digits ...