The Elecrow Crowtail – Microwave Sensor 2.0 is a non‑contact motion detection module that uses the Doppler radar principle to sense moving objects. Unlike PIR sensors, this module does not rely on changes in infrared radiation, making it more resilient to environmental factors like temperature, humidity, dust, or ambient light. Because it is based on radar, it can detect motion through light obstructions and work effectively in harsh or variable lighting conditions. This sensor is particularly suitable for applications like automatic door openers, security systems, alarm triggering, or industrial controls where consistent motion detection is required. It uses a Crowtail interface, making connection easy with Crowduino, Arduino, or other compatible boards. The module operates on approximately 5 V, draws relatively low current (<30 mA), and has a detection distance up to about 4 meters. It emits at 10.525 GHz frequency, and the output signal can be used in digital logic (HIGH/LOW) to trigger actions. Safety is considered; it uses low power and emits non‑harmful microwaves. Dimensionally, the sensor board is of moderate size, allowing mounting in enclosures or integration in panels. Given its robustness against environmental variables and ability to sense motion without physical contact, the Crowtail Microwave Sensor 2.0 is a strong choice when reliable motion detection is needed in less‑ideal conditions.