This is the SR04 version of this module, with wide supply voltage from 3 to 5V. It is hardware and software compatible with the old version, and has the same dimensions. The minimum operating voltage of the address 3V allows it to be directly connected to a 3.3V powered MCU. The HC-SR04 is an ultrasonic distance measuring module, commonly used for object avoidance, navigation and altitude hold purposes. Please note: The back of this module might look a bit different that the picture. But, the functionality and size will be identical. Board connection mode: VCC, trig (control end) Echo (receiver end) Out (empty pin, GND) Note: The TRIP pin is connected to an internal 10k pull-up resistor. Use the IO port of the microcontroller to pull the TRIP pin low and then give a pulse signal of more than 10us. The Out pin is a switch output pin when the module is used as a theft protection module. The distance measurement module does not use this pin! Note: The module should be plugged in on the circuit board to be powered on to avoid high level of malfunction. If it is generated, re-power can be solved. Features: Detection angle is less than 15 degrees Working temperature: -20~80 degrees Celsius Detection distance: 5V 2cm~450cm; 3.3V 2cm~400cm Wide Voltage Operation: 3V-5.5V Package Includes 1 x Ultrasonic Module SR04 [mx_insert-post-ebay slug="ebay-t-default"] SKU: SEN5-002 Category: Distance Sensor Tag: ultrasonic