I believe its described as continuous multi-band scan. Here is a description of this feature. Driving down a road where a Wallmart is up ahead about 100 yards and triggering my V1 on K band with a constant alert growing in strength, suddenly the special alert tone sounds indicating another signal source is either added to the band the current false is on or from another band - in this case a radar trap 100 yards beyond the false signal location that's on Ka. The V1 then flashes the real threat signal's band (in this case the Ka band indicator led) and thus warned me of a real threat beyond the false signal location. This feature is part of the "bogy counter" for each band plus another signal from another band if present at the same time with the alert sound followed by the band led flashing to indicate the real threat on another band.
Some say all modern detectors do this (constant multiple band scan) and others say it is a unique feature of the V1. I believe the special alert tone and flashing band led when multiple signals are received is a special feature of the V1. I think that if all modern detectors do scan all bands at the same time (the strongest signal gets the priority alarm), only the V1 indicates the real radar signal from the false signal(s) detected at the same time even if on another band. Do other RDs have this ability?