Features: 100% brand new and high quality Current sensor chip : ACS712ELC-05/20/30 ; Pin 5V power supply, on-board power indicator ; The module can measure the positive and negative 5/20/30 amps , corresponding to the analog output 185m/100m/66m V / A; There is no sense current is passed, the voltage output is VCC / 2; PCB-board size :approx 31 (mm) x13 (mm) /1.22x0.51in Package Includes: 1 pc x ACS712 Module Specifications: Module : ACS712 Material:PCB-board Size: approx 31 (mm) x13 (mm) /1.22x0.51in Type: 5 A /20 A / 30 A (Optional) Quantity: 1PC note: ACS712 Hall detection is based on the principle , try to avoid using the magnetic field caused by the impact of this Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you