A website allowing customers to request invitations showed a closeup of a black device with Amazon branding on it. The dimensions of the device were not clear from the photo, though.
Amazon has been rumored to be releasing a smartphone for years and analysts have long speculated about how the e-commerce giant might integrate its current business into a smartphone.
One of the differentiating features analysts expect the device to have is a 3-D display, which would enable 3-D gesture tracking. Such a display would help the company stand out in an already crowded smartphone market.
Apple is also rumored to be working on a device with such technology and Intel's CEO Brian Krzanich told CNBC earlier this year his company's partners are already integrating its 3-D camera technology into mobile devices.
It was reported last year that Amazon's phone would be free, but CEO Jeff Bezos denied that the phone would cost nothing.
Read More Is this Amazon's new smartphone?
Check out the video the company posted below.