AMS1117 1.2~5V DC Step-Down Voltage Regler Adapter Convertor Supply Module
1PCS AMS1117-3.3 V+DC jack 1PCS AMS1117-5.0V+DC jack. onboard AMS1117-5.0 chip/onboard AMS1117-3.3 chip. Cannot reverse polarity, or it will be short circuit, or will be born easily ! 2 Step-down modules.