1, The current sensor chips: ACS712ELC-05B;
2, pin 5V power supply, onboard power indicator;
3, the module can be measured plus or minus 5 amps, corresponding to the analogue output of 185 mV / A;
4, there is no the detection current through, the output voltage is VCC / 2;
5, PCB board size: 31 (mm) x13 (mm);
Note: ACS712 Hall detection principle, when you use to avoid magnetic field impact this!

Arduino Ultrasonic Range Detection Sensor
1A Micro USB 18650 Lithium Battery Charging Board with protection
MAX7219 Dot Matrix Module