4 Adjustable Vent HolesThe ultimate design for retainer storage For better ventilation and well protection, we specially design 4 alternative vent holes in the retainer holder, which means you can open it to aerate your retainer fully or close it to guard your retainer from dirt and dust. keep your orthodontic device always fresh and dry wherever you take. Compatible with 99% RetainersTaking into consideration that there are many different brands of invisible brace in the market, our retainer case is widely compatible with 99% brands of retainers and aligners, such as Invisalign, Ormco, SmileDirectclub, Alignerco, Candid, byte, easy smiles, 2U smiles, Clearcorrect, New Smile , Smilelove, Snapcorrect, Suresmile, Strayt and so on. Sufficient Storage SpaceThis retainer case is big enough to hold 2 pieces of upper and lower retainers or aligners(3.43''x3.43''x1.06'').Not only that, it still have extra room for most of your clear aligner tools & orthodontic accessories.Plus, the mirror is also a great help when you need to put the retainer on or off outside. Protect on the goFeatures slim and lightweight, this aligner case is convenient to put in the pocket and carry to anywhere.The strong and powerful magnet ensures your case be closed during the transportation. You are now free to travel with your retainer and never worry about losing or damaging.Our aligner case will safely carry and protect your aligner throughout the whole treatment.