10PCS 40KHZ 16mm 12mm 10mm BLACK Ultrasonic Sensor 40KHZ Receiver Transmitter R and T TCT40-16T/R black metal shell

10PCS 40KHZ 16mm 12mm 10mm BLACK Ultrasonic Sensor 40KHZ Receiver Transmitter R and T TCT40-16T/R black metal shell

AliExpress