When Johnson Controls announced GLAS back at CES, the flagship feature of the $319 translucent smart thermostat was its integration with Microsoft’s Cortana smart assistant. Now Cortana has company: ahead of its upcoming August 24th release date, the company has announced that GLAS will support Amazon Alexa and Google Assistant, too — but there’s a catch.

Only Cortana on the device itself

GLAS itself does feature a built-in microphone and speaker, which will let users talk to and interact with Cortana straight from the device. But only Cortana is getting those privileges — users will still be able to use Alexa and Assistant through skills to control the temperature in their homes through GLAS, but you’ll need to use another device like an Echo or Google Home to do it.

GLAS is a smart thermostat similar to the Nest Learning Thermostat, with the ability to remotely control the temperature in your home and automatically learn your schedule and living patterns. It’s also like the Ecobee 4, which has a built-in Alexa speaker. But it looks to stand out from the crowd by offering the ability to track both indoor and outdoor air quality and then adjust the climate inside your home accordingly.

Customers are able to preorder GLAS for $319 from Amazon and Johnson Controls’ website, with the first batch of devices set to ship later in the month on August 24th.