Product description:

1 : onboard LM358 chips;
2 : 100 times gain circuit design;
3 : onboard 10 k adjustable resistance, adjustable magnification ;
4 : onboard power light;
5 : chip has led the main pin, can directly input and output signals;
6 : working voltage: 5 ~ 12 v ;
7 : board size: 32.7 (mm) x13.3 (mm);