3 7v 4 2v boost power board

{"cid":"91219651","title":"2A 5V Charge\/Discharge Module for Lithium Battery 3.7V\/4.2V Boost Protection Board","imgUrl":"https:\/\/img.chinax.com\/nimg\/08\/17\/43f453d02f358e5c5629423ca129-200x200-1.jpg","attrs":{"Price":"$0.25-0.36","Brand Name":"creatall","Model Number":"None","Minimum Order Quantity":"300","Functional Application":"battery charging, power supply, protection","Description":"2A 5V charge and discharge integrated module","Place of Origin":"China","Mounting Type":"None"}}