WITTY PI 3 REV2: Realtime clock and power management for Raspberry Pi

Description

Witty Pi 3 is the third generation of Witty Pi, and Witty Pi 3 Rev2 is the second revision of Witty Pi 3
. It adds realtime clock (RTC) and power management to your Raspberry Pi, and can define complex ON/OFF sequence with simple script. Witty Pi 3 Rev2 supports all Raspberry Pi models with 40-pin header, including A+, B+, 2B, Zero, Zero W, 3B, 3B+, 3A+ and 4B.
Features
Power your Raspberry Pi with higher voltage (up to DC 28V).
Gracefully turn on/off Raspberry Pi with single tap on the button.
Fully cut the power of Raspberry Pi and all its USB peripherals after the shutdown.
Automatically synchronise time between realtime clock and Raspberry Pi.
Monitor the temperature around your Pi (thanks to the sensor in RTC chip).
Schedule the startup/shutdown of your Raspberry Pi.
Write a script to define complex ON/OFF sequence.
Shutdown Raspberry Pi when input voltage is lower than the threshold value.
Turn on Raspberry Pi when input voltage raise over the threshold value.
Long hold the button to force power cut (when the OS loses response).