Aj Sr04m Datasheet

The is a rugged, waterproof ultrasonic ranging module often used as a more durable alternative to the popular HC-SR04. It features a separate waterproof probe connected by a cable, allowing the main control board to stay dry while the sensor works in harsh or wet environments. Core Specifications

The AJ-SR04M has four pins:

The original AJ-SR04M datasheet is not always available on major manufacturer sites (e.g., ST, TI) because it's a module. However, you can download it from: aj sr04m datasheet