Google has filed with the FCC for a new "wireless device" that incorporates its innovative Soli radar technology, as well as 802.11n Wi-Fi and Bluetooth. Speculation is rife about the nature of this mystery device, with guesses ranging from a new Nest Thermostat to a potential Pixel Watch 3. The absence of Thread or Zigbee connectivity suggests it may not be a smart home hub, while the presence of a "base plate" hints at a wall mountable or stand design. The device appears to be hardwired and is intended to be at least 20cm away from the user, ruling out possibilities like a smart speaker or wearable device. With Google's history of incorporating Soli radar into its products, the purpose of this new device remains a tantalizing mystery for now.