Features: 1. Dual USB 5V 1A 2.1A Mobile Power Module; Boost Module With Display Charging Board Module 4. Meet Your Diy Personalized Needs, But You Must Understand Basic Electronic Assembly 2.18650 Lithium Battery Digital Display Usb Charging Board With 4 Cells Of 18650 3. This Is The Mobile Power Module Accessory, 18650 Circuit Board Shell 5. The Motherboard'S Built-In Protection Functions: Charging Overcharge Protection, Over-Discharge Protection, And Over-Current Protection. After The Intelligent Output Device Is Fully , It Automatically Stop Charging To Prevent Overcharging Of The Mobile Phone And Stabilize The Output Voltage And Current Without Harming The User'S Equipment., Manufacturer: PokFhgur