Specifications   
  - Input: DC 4.5 V-7 V (input voltage must be more than to output voltage high 1 V above.)
  - Output: 3.3 V, 800 mA (load current can't more than 800 mA)
  - PCB size:8.6* 12.3 mm
  - Package includes: 1x power module
Please Notice 
  - Cannot reverse polarity , or it will be short circuit, or will be burn easily