... 9. Buzzer er can be embedded in the display housing. 10. 8-sensor model, 6-sensor model, 4-sensor model, 3-sensor ... .11. Factory Certification: ISO 9001:2008 Brand SunwayiModelSW-X3502-8-4VoltageDC 12VWarming Soundbuzz warming Power4WWorking Temperature-35°C~+80°Csensor2 ... ,3,4,6,8, opticalDetect Distance 0.3~2.5 MApplicationAll CarAlarm Distance0. ...