ITEM NAME:Lithium Li-ion 18650 3.7V 4.2V Battery Charger Board DC-DC Step Up Boost Mod M&E.Output reference maximum current:5V 1.4A , 9V 0.8A, 12V 0.6A. Size :3.3 2.3 0.9cm. 1 Due to different production batches, there may be 1-3cm deviation in size.