The Stella repeater system amplifies the frequencies from the operators. (700MHz-2600MHz). It is agnostic as to what services (3G/4G/5G) are carried over these frequencies.
This is a big advantage to a Repeater system. You are future proofed against new services that may appear in the future.
5G has appeared in recent years, and even older model Stella repeaters which were installed many years ago, are now successfully repeating the new 5G service, no update to the hardware or software required. This is a big benefit to the customer.
The Stella iRepeaters can be remotely monitored and they automatically re-calibrate to provide optimum coverage if there are external environmental changes.