# OK Duo USB-A slot size question **URL:** \ **Category:** Uncategorized\ **Created:** [May 23, 2022, 4:01pm UTC](https://onlykey.discourse.group/t/ok-duo-usb-a-slot-size-question/752 "2022-05-23T16:01:37Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![usual.coffee3874](https://avatars.discourse-cdn.com/v4/letter/u/7ba0ec/32.png) [@usual.coffee3874](https://onlykey.discourse.group/u/usual.coffee3874)\ **Post date:** [May 23, 2022, 4:01pm UTC](https://onlykey.discourse.group/t/ok-duo-usb-a-slot-size-question/752/1 "2022-05-23T16:01:37Z")
Hey there, can the usb C adapter portion of the OK Duo support the thickness of the USB-A OK? As in, if you own both products, could you plug the USB-A OK into USB-C adapter of the OK Duo, or would the OK USB-A male end be too thick to fit inside the Duo’s slot? I’m looking for a portable way to use my OK USB-A in a world thats increasingly USB-C-first (especially for mobile devices.) There are certainly adapters out there, but I’m looking for something thin as a key and with a keychain hole in it. I cannot seem to find such an adapter elsewhere without sacrificing thinness. Thank you for any feedback, ---
**Author:** ![t11](https://avatars.discourse-cdn.com/v4/letter/t/8e7dd6/32.png) [@t11](https://onlykey.discourse.group/u/t11)\ **Post date:** [May 25, 2022, 1:25pm UTC](https://onlykey.discourse.group/t/ok-duo-usb-a-slot-size-question/752/2 "2022-05-25T13:25:25Z")
You can use the DUO adapter on an OnlyKey but it’s not made for it so does not fit well. ---
**Author:** ![usual.coffee3874](https://avatars.discourse-cdn.com/v4/letter/u/7ba0ec/32.png) [@usual.coffee3874](https://onlykey.discourse.group/u/usual.coffee3874)\ **Post date:** [May 25, 2022, 1:38pm UTC](https://onlykey.discourse.group/t/ok-duo-usb-a-slot-size-question/752/3 "2022-05-25T13:38:23Z")
Hey thanks for the reply I really appreciate it. To clarify: it may not be nice, but it is in fact functional? Thank you, ---
**Author:** ![t11](https://avatars.discourse-cdn.com/v4/letter/t/8e7dd6/32.png) [@t11](https://onlykey.discourse.group/u/t11)\ **Post date:** [May 25, 2022, 2:27pm UTC](https://onlykey.discourse.group/t/ok-duo-usb-a-slot-size-question/752/4 "2022-05-25T14:27:56Z")
Yes it is in fact functional ---
**Author:** ![usual.coffee3874](https://avatars.discourse-cdn.com/v4/letter/u/7ba0ec/32.png) [@usual.coffee3874](https://onlykey.discourse.group/u/usual.coffee3874)\ **Post date:** [May 25, 2022, 4:05pm UTC](https://onlykey.discourse.group/t/ok-duo-usb-a-slot-size-question/752/5 "2022-05-25T16:05:24Z")
Awesome. I don’t know of anywhere online that i could confirm that information, so thank you for taking the time! ---
**Author:** ![ted10007](https://avatars.discourse-cdn.com/v4/letter/t/50afbb/32.png) [@ted10007](https://onlykey.discourse.group/u/ted10007)\ **Post date:** [January 9, 2023, 10:48am UTC](https://onlykey.discourse.group/t/ok-duo-usb-a-slot-size-question/752/6 "2023-01-09T10:48:09Z")
I have tried using the USB C Duo adapter with the regular Onlykey and it does work. It fits in the adapter very loosely so when tapping the buttons you have to use extra care to ensure the Onlykey does not slide out of the adapter. ---
**Author:** ![t11](https://avatars.discourse-cdn.com/v4/letter/t/8e7dd6/32.png) [@t11](https://onlykey.discourse.group/u/t11)\ **Post date:** [January 11, 2023, 7:55pm UTC](https://onlykey.discourse.group/t/ok-duo-usb-a-slot-size-question/752/7 "2023-01-11T19:55:41Z")
Yes, the DUO USB-C part is not a standard adapter, have you considered using the adapter here: [Portable 2-in-1 USB-A to Lightning and USB-C OTG Adapter | Compatible – OnlyKey](https://onlykey.io/collections/all/products/jh-link-new-2-in-1-type-c-lightning-usb-otg-adapter-3-1-data-transfer-for-mobile-phone?variant=41949487202490) ---
**Author:** ![dev.null](https://yyz2.discourse-cdn.com/free1/user_avatar/onlykey.discourse.group/dev.null/32/393_2.png) [@dev.null](https://onlykey.discourse.group/u/dev.null)\ **Post date:** [August 14, 2024, 2:36am UTC](https://onlykey.discourse.group/t/ok-duo-usb-a-slot-size-question/752/8 "2024-08-14T02:36:35Z")
The 2-in-1 adapter is big in comparison to the duo adapter. I carry my OK-A in my wallet, having to have that big adapter isn’t workable. I may buy the duo just for the adapter (I wouldn’t use duo, it would act as a password written down on a card in my wallet). It’d be nice if OK sold the duo adapter just by itself, or made a variant with a tighter fit and sold it with the A (separately, or as a package). Imagine all the A owners who would immediately buy the small adapter… ---
**Author:** ![t11](https://avatars.discourse-cdn.com/v4/letter/t/8e7dd6/32.png) [@t11](https://onlykey.discourse.group/u/t11)\ **Post date:** [August 14, 2024, 6:10pm UTC](https://onlykey.discourse.group/t/ok-duo-usb-a-slot-size-question/752/9 "2024-08-14T18:10:14Z")
You can buy just the DUO shell by itself here [Extra OnlyKey DUO USB-C Shell (Black)](https://onlykey.io/collections/all/products/extra-onlykey-duo-usb-c-shell-black)