Description: Portable External Battery For Mobile PhonesCE, ROHS, FCC certificatesUniversal applicabilityUSB output, can be applied to the smartphone, tablet, Galaxy Tablet, Mobile phone, MP3, MP4 and other equipmentRed light is state of charging, blue light is working, visible and intuitive and clear.Use 18650 samsung batteries cell, replaceable batteries, economical and practical.        Support synchronously charging and discharging function, mobile charging power supply and power supply Features: Intelligent Power Indication.Over-charge protection, discharge protection, over-current protection, short-circuit protection, explosion protection.High-efficiency of power conversion. Specifications: Capacity : 4000 mAh, Lithium Polymer Battery CellBattery Type : Samsung BetteryEfficiency : 80%-85%Charging Time : 6-8 hoursStandby Time : 72hours-120hoursBattery Life Cycle : 550timesInput : USB5V1A Output : DC5V 1AWeight : 160 gDimensions: 175 x 65 x 7.5 mm                          Working Temperature : -25°C~55°C