... -mark,FCC 3.Max power 4.high quality 1. Buzzer without Display2. Buzzer Type3. 4 sensors system4. 4 Operating voltage rating: DC12V5. Max ... .1m~1.5m8. Alaem voice: >100dB9. Ultrasonic frequency: 40KHzproduct name:car parking sensor system LED professional buzzer,Mini Black LED parking sensor,auto parts,car accessories,reverse sensor,P1148B car parking sensor,reverse sensor,P1148B