ITEM NAME:USB Lithium Battery Charger Boost Converter Module 18650 Power Charger Board ME Feature: Input current:600mA Input voltage:3-5V USB Output voltage:5V USB Output current:1000mA Max Charging input voltage:5V,micro USB Battery overcharge protection cut-off voltage:4.25V Battery short circuit protection:YES Instructions: recharge the red light turn on when charging, fully charged the light turn off. Discharging the blue light turn on. Size:L45mm*W14.5mm*H5mm Package include: 1x Boost Converter Module.1x Boost Converter Module. Battery short circuit protection:YES. Input current:600mA.