Shiva electronics offers Ultrasonic Sensors. These are self-contained compact design, with excellent receive sensitivity, operating with 50 KHz electrostatic transducers and with integrated SMT electronic circuitry. The sensors housed in M50 enclosures have sensing range of maximum 40 feet. Supply voltage is 12 VDC/24 VDC. All the models can be externally triggered or can continuously sense at a 10 Hz rate.