Features: This module is a portable backup power supply, whose input is pair with 5V adapter for charging the internal battery. Provide 5V/3.0A USB2.0 power output to external devices using build-in battery of portable devices. Equipped with LED digital display, and the LED digital display screen will show the battery level. The display is clear showing, and the battery level is accurate to 15%. With overcharge, over discharge, shortcircuit , and constant current protections. Specifications: Material: ABS+Metal Type: 5V2.4A three charging port, 5V 2A 1A charging port(optional) Size: approx. 68x27mm/2.68x1.06inch Package Includes: 1 Piece 18650 Digital Display Charging Module note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.