1.Weight:42g. 2.Working voltage :3.3 V / 5 V is optional. 3.Maximum current:500 mAh. 4.Support: 7-23 v input. 5.Use external power supply:at most 2 a 5 v. 6.Power supply. 7.More stable AD sampling. 8.Easier to press the reset button. 9.The expansion of the pin leads.