Material:It is made of high quality material for electronic accessories and is treated with nickel 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. This ACS712 current sensor can measure current up to 5A and is easy to install thanks to its compact dimensions. This range module is the current sensor chip ACS712ELC-5A. ACS712 is based on the principle of hall detection, please try to avoid the influence of the magnetic field when using it. Material: electronic components Color: as shown Package Contents: 10 Sensor Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.