Features: Keep your devices powered without interruption using this reliable Uninterruptible Power Supply HAT. Monitor battery voltage, current, and capacity in real time for accurate power management. Designed for enthusiasts seeking a stable power solution for their projects. Adopting pin interfaces design, suitable for Raspberry 3/3B+/4B board, supporting dynamic paths management and more stable power supply. I2C bus communication, monitoring the batteries voltage, current, power, and remaining capacity in real time; Batteries warning indicators, easy to check if the battery is connected correctly; The onboard battery protect circuit prevents overcharging, discharging, overcurrent, and short circuits, ensuring stable and safe operation. The onboard MCU chip management supports power on detection and start up functions. Specifications: Material:ABS Size:Approx.58x56mm/2.28x2.2inch for Raspberry 3/3B+/4B; Output:5V Charging Power:5V Type-c Control Interfaces:I2C Mounting hole:3.0mm Battery Specifications:5000mAh 21700x2 (not included) Package Includes: 1xUPS HAT(battery not included) Screw Pack 1xAcrylic cover note: Please allow 1-2cm errors due to manual measurement,please make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.