There are two hardware options – a RPI and USB unit.
ZUMSPOT RPI (https://www.moonraker.eu/mmdvm-nano-hotspot-5495)
This is a RPI unit which supports multiple modes and contains a 1.3″ OLED display. It can be connected to a computer or raspberry pi and uses the BlueDV software.
ZUMSPOT USB (https://www.moonraker.eu/mmdvm-nano-hotspot-5496)
This USB dongle supportds multiple modes. It can connect to any device that can utilise BlueDV including mobile phones via an OTG cable (check the Hotspot/Software menu). Whilst BlueDV is available for various platforms (Android, iOS, Windows and Linux), each version differs, with the WIndows version being more up todate [always use the latest TEST version of the software]. The Zumspot USB will also work with Pi-Star on a Raspberry Pi. I suggest using v4 of the Pi-Star software and select modem type “Zumspot USB Stick”.