Unfortunately, there is never any useful information at Digitec, and I've noticed that for years. I always do it like this: copy the manufacturer's article number and name or both, then enter them in the Google search and add the PDF. That way I actually get something useful for everything (the good price at Digitec and the details from the internet, that's how I solve it for myself). Even if I think about how much very good information is available from the manufacturer for a smartphone, for example, I would never buy something with the small description from Digitec, because if you're unlucky you can even find incorrect information.

I then found information on the model at ZTE Australia, it is apparently a 4G router that can do a maximum of Cat 20 (2Gbit/s download).

https://ztemobiles.com.au/4g-mf289f

I'm curious to see how much information can be copied here, because I found a lot of additional information on another site:

Technical specifications of the GigaCube 4G Z21 (MF289FB)
Modem features
Modem 4G-Cat20
Download up to 2.0 Gbits
Upload up to 150 Mbit/s
Modulation upload 2CC, 64QAM
Modulation download 4x4 MIMO, 4CC, 5CC, 256QAM
SIM card slot 1 x Nano-SIM (4FF)
Frequency bands LTE B1 (2100), B3 (1800 +), B7 (2600), B8 (900), B20 (800 DD), B28 (700 APT), B32 (1500 L-band)
Frequency bands UMTS B1,B8
LAN port / WLAN
WLAN standards 802.11a/b/g/n/ac
Frequency bands 2*2 MIMO 2.4 GHz & 5 GHz (Wifi 5)
LAN standard 10/100/1000 MBit/s
LAN ports 2 x RJ-45, 1x WAN switchable
Connections
1 x power connector
2 x Ethernet LAN/WAN
4 x mobile radio connection (SMA)
2 x TS9 antenna connection without function
1 x RJ11 telephone connection without function
Mechanical data
Size 78 x 191.5 x 132 mm (L x W x H)
Weight 475 g
Operating voltage 12 volts
Maximum operating temperature -0° C to 40° C
Scope of delivery
CAT 20 router with 4 external antenna connections
4 x 2 x 5 dBi rod antennas for standard operation (optional, if selected)
Power supply 220 V to 12 V
Data cable