DESCRIPTION For a secure fit to different type of feeding bottles, you need to use Autumnz Adaptor (which can be purchased separately depending on type of feeding bottles used) and fit to the portable baby bottle warmer. Then twist the feeding bottle to the warmer unit. BPA Free Available in Wide Neck / Standard Neck (depending on type of feeding bottle used) Wide Neck (WN) -Comotomo, Dr Brown , MAM, Pigeon, NUK, Tommee Tippee Standard Neck (SN) -Medela, Pigeon, Dr. Brown, NUK NOTICE ⚠️When using any types of wide neck adaptors, kindly ensure the silicone ring (that comes with the adaptor) is attached to the pp wide neck adaptor. Also make sure the original silicone ring in the stainless steel base of the portable warmer is put in the right position all time. ⚠️ When using standard neck adaptor, the silicone ring that comes with this adaptor need to be placed to the stainless steel base of the portable warmer. Remove the original silicone ring that comes with the portable warmer. Keep it for future usage on other bottles, if needed.