Features: 1. Dual USB 5V 1A 2.1A Mobile Power Module; Boost Module With Display Charging Board Module 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 4. Meet Your Diy Needs, But You Must Understand Basic Electronic Assembly 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 Charged, It Will Automatically Stop Charging To Prevent Overcharging Of The Mobile Phone And Stabilize The Output Voltage And Current Without Harming The User'S Equipment. Description: 1. Micro-Usb Input: 5V 1A 2. Usb Output: 5V 2.1A /5V 1A (Dual USB Connector) 3. Charging Display: Intelligent Digital Display 4. Battery Type: Liquid Lithium-Ion Battery (18650) 5. Product Size: About 57x28mm 6. Screen Size: About 28x14mm Depending on the batch, the appearance, color, and printing of the product may vary, which does not affect use. Material: PCB colour: As shown Package Contents: 5 * Power Module