USB Real-Time Clock (RTC) for Raspberry Pi [discontinued] _RPI_BOOK you can use it with

you can use it with A/B if you solder in an extra-tall 2x13 header (not included) instead of the included 2 x 20 header

you don't even need either to use this work-holder but its waaaay better if you pair them up

UHF RFID MODULE-USB，this RFID tag reader is a remote read-write module of IC card using non-contact UHF technology

Adafruit FONA 808 MiniGSM + GPS adds cellular voice

USB Real-Time Clock (RTC) for Raspberry Pi [discontinued] _RPI_BOOK you can use it withThis is an open source USB real time clock for the Raspberry Pi, allowing your project to maintain accurate time and alarm alert functions without internet connectivity regardless of power cycles and reboots. It uses a DS3231 RTC chip which runs the USB RTC with extremely high efficiency and accuracy. The RTC has cross platform support which enables it to be used on different platforms such as Windows, MAC and more. The USB connectivity is handled via