This range module is the current sensor chip ACS712ELC-5A. This ACS712 current sensor can measure current up to 5A and is easy to install thanks to its compact dimensions. Material:It is made of high quality material for electronic accessories and is treated with plated , which has excellent performance against oxidation, electrical conductivity and durability. The inner conductor is made of pure copper. It is and long-lasting . Sensor Specification: Operating Power: 5V Output Power: 100mV/A Sensor size: 3.1 cm x 1.3 cm. ACS712 is based on the principle of hall detection, please try to avoid the influence of the magnetic field when using it., Manufacturer: Akfldms