... 3.5" truck reversing aids system 2,Display the distance on the screen 3,alarm by English speech 4,two ... camera and parking sensors 6,2,4 sensors for option 7,alarm by english speech 8,Display the distance ... temperature-30°C---+80°CAlarm typeSpeaker (English speech)alarm volume65dBSpeech report2.0m,1.5m,1.2m,1.0m ... CE & FCCAfter- sale service: one year warranty English alarm truck reversing aids system