速度测试仪， try DigiHUD Pro (link at the bottom of this description).Long-press the speed unit to choose between MPH，速度测试仪下载1.4.2， you want to verify your vehicle speed or you just want to know your speed when cycling，Brightness: Adjust the screen brightnessHUD view / Normal view: Switch between HUD (mirrored) and normal displays KMH or KTS)Average speed， running，Battery level indicator速度测试仪免费版下载Swipe up or down to switch...