Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards like Raspberry Pi 4B/3B+/3B/2B/B+/A+/Zero/Zero W/Zero WH Waveshare UPS HAT E für Raspberry Pi, 4x Akku-Slots, Bi-Directional Power Your Pi Seamlessly From Power Connection OR The Backup Batteries, charge and power output at the same time . It is able to charge the batteries and provide power output at the same time from external power supply Protection Circuits For Over Charge/Discharge, Over Current, Short Circuit, And Reverse. Please charge with the charger we provided , in case the item is damaged if using another charger . Along With The Equalizing Charge Feature, More Safe And Stable Monitoring The Batteries Voltage, Current, Power, And Remaining Capacity. 5 V USB output, convenient for powering other boards Features Uninterruptible Power Supply for Raspberry Pi Hat Pi Avec Protection Charge Waveshare UPS Hat For Raspberry Pi, 5V Uninterruptible Power Module Batterie 8.4V Chargeur Inclus Convenient For Powering Other Boards The Waveshare HAT connects to the Raspberry Pi via USB 3.2. This means the M.2 module must support USB for communication. If the module is USB-compatible, it is more likely to work with the adapter RPi screws pack (2pcs) x1 Multi batt protection circuits: over charge/discharge protection, over current protection, short circuit protection, and reverse protection, along with the equalizing charge feature, more safe and stable It is able to charge the batteries and provide power output at the same time from external power supply Package Content UPS HAT x1, 8., 4V battery charger x1 I2C bus communication, monitoring the batt voltage, current, power, and remaining capacity in real time Please contact us if you have any problem . When installing the batteries in the first time , if the WARNING LED light is on , which means the corresponding battery assemble reversed,charging is forbidden in this case, please reinstall the batteries. Power Your Pi Seamlessly From Power Connection OR The Backup Batteries, charge and power output at the same time .