Feature: The maximum voltage of this product is 32 volts, it is recommended to use within 28 volts! This module is a pure step-down module without boost function. If you want to use 20V output, you must use a for DC power supply of more than 21V; the product low voltage can reach 6V, but most of the fast charge not be activated at 6V; 100W output power Can be reached at PD output (PD20V, 5A). For low voltage and high current fast charging, please use the original data cable. If you want to measure the charging voltage and current, you must use a low internal resistance USB meter! Otherwise it affect the charging current! USB port is required for OPP-O and for mobile phone charging! QC4 + / QC4.0 / PD3.0 and other protocols have to use TYPE_C port! When the USB port and TYPE_C port are plugged in at the same , both ports are 5V output! Specifications: Item Type: Quick Charge Module Size: 53x46x21mm/2.08x1.8x0.8inch Color: Black Material: Plastic Package Contents: 1* Quick Charger