The website description is for a MK335 not a MK320. With the MK320 you do not get a unifying receiver and cannot add more devices. THe MK335 gets a unifying receiver and better mouse. I am returning this. Interestingly enough, the app description is correct.
Thank you for letting me know. I’ve sold out the sale until they can fix the features.
Woot CS will help you with the return.