Costco's latest Kirkland Signature hearing aid (KS 9) is manufactured by Sonova, the same hearing aid company that manufactures Phonak, Unitron, and Hansaton hearing aids, among others. Sonova is currently (as of mid-July 2019) the only hearing aid company with "Made For All (MFA)" universal Bluetooth streaming technology, and with Kirkland Signature 9.0, Sonova's signature audio streaming / hands-free smartphone technology is now available to Costco members nationwide. As usual, Costco's pricing is very aggressive, with the KS9's coming in at $1499.99 per pair.
While some have speculated that the KS9's are the same as the the Phonak Marvel or Unitron Discover, Sonova has indicated that the KS9's are a unique build, and not equalivalent to either model in terms of software or hardware features. Some have speculated that the plastic shell is borrowed from Hansaton, and others have noted that Costco hearing instrument specialists and audiologists are using Phonak fitting software to perform hearing aid fittings.
Update for 2020! The KS9 is now available with a telecoil and supports RogerDirect™ and the myPhonak app for wireless remote mic audio streaming. Hearing Tracker has confirmed that there is no rechargeable option.