LED indicator: "CR" LED is charging status indication, "OK" LED is fully charged or in constant voltage mode.Wide range of usesHigh safety performanceEasy to understand and easy to operateBattery overvoltage protectionscope:2-Cell(2S) 8.4V version:Input voltage: DC 3-6V (recommended DC 3.7V 5V)Input current: 1A(1A Version)Charging voltage : 8.4VCharging current: 0.55A(1A Version)Working environment temperature: -40 to +85Colour:redMaterial:PCBSize:39x18x 6.3mmPackage Contents:1 x ModuleOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.