Features: 1. Two working modes: divided into outdoor portable power supply and indoor UPS power supply. 2. As outdoor portable power supply, the motherboard is only powered by lithium battery. The maximum external power supply capacity is 5.1V 2.5A. 3. As indoor UPS power supply: insert Micro-USB into ordinary 5V 2A Power adapter, and the external output USB-A interface can output a maximum of 5.1V 3A. 4. 4+2LED for charging and discharging, and battery power display. 5. The motherboard integrates overcurrent and overdischarge protection. 6. The external output port has a self-recovery fuse to prevent the for Raspberry Pi from being burnt due to an external short circuit. 7. When the total current of 2 USB output ports reaches 3A, the self-recovery fuse will be fusing. When the external port is no load, the 5V output will automatically restore. 8. PMU over-discharge protection: When the lithium battery voltage is lower than 2.8V, the PMU judges that the battery has been over-discharged and automatically cuts off the 5V output. Specification: Condition: 100% brand new Battery: 1 x 3.7V 4000mAh lithiium battery Package Weight: Approx. 122g/4.3oz Package l ist: 1 x Lithium Battery Expansion Board 1 x Lithium Battery 1 x Set of Installation Accessories Note: Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. .