This router is built-in PCIE slot, it can be used to install 3G/4G module to support 3G/4G function.

The price is built-in 4G module, suitable for most European countries, if you need other 3G/4G chips, please let me know which country you will use the router, and then I'll choose the suitable module for you .
 
NL668-EAU for most European countries
FDD:B1/3/5/7/8/20/28 TDD:B38/40/41
WCDMA: B1/5/8 
GSM: 850/900/1800MHz
Specification
Hardware
Product Mode
ZBT-WE1326
chipset
2.4GHz chipset:    MT7621/Dual core/880MHz
5G chipset:             MT7612E
RAM
DDR3 256MB (Maximum DDR3 512MB) 
SPI FLASH
SPI 16MB (Maximum 32MB)
Protocol
IEEE802.11ac/a/b/g/n
IEEE802.3, IEEE802.3u
Wireless Rate 
2.4G: 300Mbps
5G:     867Mbps
Work Frequency
2.4GHz, 5.8GHz

Antenna
2*5dbi 2.4Ghz antennas
2*5dbi 5.8GHz antennas
Interface
1* 10/100/1000Mbps Auto-MDI/MDIX WAN port,
4* 10/100/1000Mbps Auto-MDI/MDIX LAN port,
1* USB 2.0 port, 1* SD Card Slot, 1*Mini-PCIE slot, 1*SIM card slot
LED
Power/2.4G/5G/WAN/LAN4/LAN3/LAN2/LAN1
Button
Reset Button
Max Power consumption 
< 12W
Power Adapter
DC 12V 2A
Housing size (L*W*H) and color
Size: 235*135*25.5mm
Color: Black silver (accept custom)