Device savings differ by model, but an additional $ 20 or so will get you the ad free model of the devices. (androidauthority.com)
This is not a hands - free model like many of the earlier ones in our breast pump review. (geekwrapped.com)
The glasses - free model relied on an eye - tracking camera system that delivered separate images to each eye, creating a 3D effect in the brain. (scientificamerican.com)