I. Featuresof Ultrasonic Sensor EFR-40/48/58RS18A: Functions: transmitter and receiverTerminal: pin.Housing material: aluminum.Applications: range finders, burglar alarms, automatic doors, remote controls, ultrasonic distance meters.Features: High sensitivity, high reliabiluty, less power consumption and waterproofII. Specifications: NominalFrequency (kHz) 40/48/58±1 Capacity (pf) 2000±15% RingDownTime (ms) ≤1.2 SoundPressureLevel(dB) 109±5 Sensitivity (dB) -70±5 Resistance (Ω) 500 Directivity(° ) 90±5 Max.InputVoltage (Vp-p) 150 OperatingTemp.Range(oC) -30±80 StorageTemp. (oC) -40±85 Weight (g) 4.8