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 , which does not affect use. Material: PCB colour: As shown Package Contents: 5 * Power Module Only 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. 3. This Is The Mobile Power Module Accessory, 18650 Circuit Board Shell 2.18650 Lithium Battery Digital Display Usb Charging Board With 4 Cells Of 18650 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 Will Automatically Stop Charging To Prevent Overcharging Of The Mobile Phone And Stabilize The Output Voltage And Current Without Harming The User'S Equipment. 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