Integrated charging and boost module for easy use.Automatically charges the battery when an external power supply is available.Boosts voltage from the lithium battery when no external power supply is present.Maximum input voltage of 6V, with protection against overvoltage.High efficiency in charging mode (>90%) and automatic temperature protection.The MP2636 power management module is a small, integrated charging/boost module. It fulfills both charging and boosting functions in one go, simple to use. When no external power supply is available, the lithium battery powers the output, boosting the voltage; the Boost indicator light remains constantly on. Note: When powered by an external power supply, the output voltage will not be consistently 5V, but will be slightly lower (approximately 0.1V) than the external power supply voltage. The input voltage should not exceed 16V, otherwise the chip may be . Suitable Battery Voltage: 4.2V (3.7V lithium battery fully charged to 4.2V). Maximum Charging Current in Charging Mode: 2.5A. Maximum Output Current in Boost Mode: 2.5A. Switching Frequency: 600KHz. Dimensions: 35 x 30mm. Weight: 12g.Color: BlackMaterial: ABSPackage Contents:1*Charging and Booster 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.