Details: 

1. Current sensor chip: ACS712ELC-30A; 

2. Stick 5V control supply, onboard control pointer; 

3. The module can be estimated give or take 30 amps, relating to the simple yield 66mV/A; 

4. There is no identification current through, the yield voltage is VCC/2; 

5. PCB board estimate: 31 (mm) x13 (mm); 

Note: ACS712 Hall identification rule, when you use to stay away from attractive field affect this!