Smraza 5pcs Ultrasonic Module HC-SR04 Distance Sensor with 2pcs Mounting Bracket for Arduino R3 MEGA Mega2560 Duemilanove Nano Robot XBee ZigBee: Amazon.com: Industrial & Scientific
Amazon.com: SunFounder Ultrasonic Module HC-SR04 Distance Sensor Compatible with Arduino R3 Mega2560 Duemilanove Nano Robot Rapsberry Pi 4B 3B+, 3B, 2 Model B & 1 Model B+ : Industrial & Scientific
ERH India (1 Pc) HC-SR04 Ultrasonic Sensor Distance Module for Arduino Uno and All Type of Devlopment Boards and Robots : Amazon.in: Industrial & Scientific
Amazon.com: #10Gtek# HC-SR04 Ultrasonic Module Distance Sensor, for Arduino UNO Mega2560 Nano Robot XBee ZigBee Micro Controller, Pack of 5 : Industrial & Scientific