Feature: With a hightlight LED lamp (long press or double click power for key can start) Power has multipke safe designs.Output voltage and current is stable,never to damage user's device Power has designs of overcharge,overdischarge,short circuit for protection,does not need to worry about the for time of charging Electricity Quantity Display:4 class LED light display electricity quantity,non-operating state will be intelligently off Specifications: Input Parameter:5v/1A Input Interface:V8 interface micro USB Output Parameter: double USB output:5v/2A Conversion Rate:90% average Charging Display: when charging 0-25% one light is on,other lightis off; 25%--50%,the second light flashes,the first light is continously on;50%-- 75%,the third light flashes,front two lights are continuously on;75%---;the fourth light flashes,front three lights are continuouly on.And four lights are on charging to . Mainboard for Protection Function:overcharge for protection, overdischarge for protection, overcurrent for protection.Power does not need for protection board.If you have it,please unload. Installation Introduction: 1.Circuit board B- connects power negative,B+ connects positive.Don'for t inversely connect,it will result in burning of board.Power is series soldering,so please make sure the insulation between power and circuit when install the battery 2.Double press the switch,flashlight LED light starts,then double press tyrn it off 3.Double press starts flashlight,then press once,light will be lighting.Then for touch once start SOS mode,and press one more for time turn off LED 4.2A output is not continuous current,it changes according to USB connecting load automatic current output 5.Insurance reisitor.If battery connects incorrectly,the polarity will burn. Size:6.8x3cm/2.68x1.18inch Note: Please allow 1-3mm error due to manual measurement.pls make sure you do not mind before you bid. Due to the difference between different monitors,the picture may not reflect the actual color of the item.Thank you! Package Includes: 1x Power Bank Charging Board