Ultrasonic Sensor SetUsed for motion and distance sensing Features: Frequency: 40kHz A 1.0kHz Aluminum case Capacitance: 2000pF A 20% Transmitter- Bandwidth: 5.0kHz @ 100dB, Sound pressure level: 112dB @ 40 A 1.0kHz Receiver: Bandwidth: 5.0kHz @ -75dB, Sensitivity: 67dB @ 40 A 1.0kHz Case size: 0.30"H x 0.43" Dia. Lead length/Spacing: 0.28" Includes transmitter and receiver