1、Based on for Raspberry Pi 40pin GPIO interface, suitable for Raspberry Pi series motherboards. 2、Can communicate through the I2C interface, measure battery voltage, current, power and remaining power and other parameters, and detect the working status of the module in real time. 3、Onboard battery protection circuit, anti‑overcharge, anti‑overdischarge, anti‑overcurrent, anti‑short circuit and anti‑reverse connection, balanced charging, stable and safer work. 4、Onboard 5V voltage regulator chip, up to 2.5A continuous output current, onboard USB interface, can output 5V power, convenient to supply power to other main control boards. 5、On‑board warning indicator, easy to check whether the battery is connected reversely. 6、Supports simultaneous charging and discharging. When connected to an external power source, the system and the lithium battery will be charged at the same time. If the external power source is disconnected, it will automatically turn to the lithium battery. Item Type: UPS Power Supply Module Application: Suitable for Raspberry Pi 4B / 3B Battery: 2 x 18650 batteries, 2600 mAh 2 x Battery 1 x Pin Header 3 x Screw 3 x Nut 2 x Screw 1 x Adapter 1 x UPS Power Supply Module