This Ultrasonic Transducer is a Compact Ultrasonic Sensor & Transmitter suitable for distance measurement, with high-performance characteristics. Standard operating frequency and good sensitivity. Ideal for use in range measurements, robot applications, alarm sensors, etc Features:Excellent Directivity and SensitivityDetection Range: Up to 12mNominal Frequency: 40kHzOperating Temperature: -30oC to +85oCDimensions: 16mm Diameter, 10mm High excluding pins, Pins - 5mm HighAluminum case