i assume its the oral-b 1000 series, i have the teal one, which seems to be on sale a lot of the times. i bought the replacements heads on line, for pretty cheap, and good quality, albiet it being directly from a german distributor, so its slight difference in fititng, but it works 100%, it works better than the OEM american ones and last longer, these were not the offbrand replacements i bought, it was the official heads for the german variety.
i assume its the oral-b 1000 series, i have the teal one, which seems to be on sale a lot of the times. i bought the replacements heads on line, for pretty cheap, and good quality, albiet it being directly from a german distributor, so its slight difference in fititng, but it works 100%, it works better than the OEM american ones and last longer, these were not the offbrand replacements i bought, it was the official heads for the german variety.
This is the IO2. The replacement heads are pretty expensive for the IO series, afaik. Usually can find them in bulk on sale tho.