Geekworm Raspberry Pi UPS, X728 V2.1 (Max 5.1V 6A) 18650 UPS & Power Management Board with AC Power Loss Detection, Auto On & Safe Shutdown Function for Raspberry Pi 4B/3B+/3B June_2023_update Using Keurig paper filters can

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Geekworm Raspberry Pi UPS, X728 V2.1 (Max 5.1V 6A) 18650 UPS & Power Management Board with AC Power Loss Detection, Auto On & Safe Shutdown Function for Raspberry Pi 4B/3B+/3B June_2023_update Using Keurig paper filters canGeekworm Raspberry Pi UPS, X728 V2. 1 (Max 5. 1V 6A) 18650 UPS & Power Management Board with AC Power Loss Detection, Auto On & Safe Shutdown Function for Raspberry Pi 4B 3B+ 3B Description Document: wiki. geekworm. com X728User_manual Update History: X728 V2. 1 is released at October 15th 2021 at amazon. (Note: there maybe mixed version of X728 V2. 0 and V1. 3 at amazon warehouse, please understand.) Update: New add a buzzer controled by CPIO20. DC