A Real Time Clock (RTC) and Wi-Fi module were optional additions to the full cased Spectrum Next at the time of the original Kickstarter. They can be added to development boards and units that don't already have them, although the RTC requires soldering components to the board (whilst the Wi-Fi module is push-fit).
Adding a RTC requires the following components:
- DS1307 IC
- 8 pin DIL Socket
- CR2032 Holder
- CR2032 Battery
This is the mounting position on the PCB: