you have to have the snapon chip ring so you can put it on the birds as they get older and not loose them before the birds are returning to the loft. the new imbeded chips in the life ring would be nice,but if the chip goes bad you will still need the snapon band so the birds can still race.As far as using both types of clocks ,we here have to use the rubbers yet for some Specials who are not set up to take ETS clocks. Sometimes we take our club unit to them so we canuse the ETS .