we make ultrasonic sensor which used in remote control systems,
distance measurement systems, back collision-avoidance systems,
burglar alarms etc. Features: Specification:Ultrasonic Sensor gas sensor Features: 1)
Construction: Water proof 2) Using method: Dual use 3) Center
freqency: 40khz 4) Output sound pressure: Min 100db 5) Sensitivity:
Min -75db 6) Directivity: 52 7) Capacitance: 2000?0%pf Safety Approval: