They use a Quantenna 4x4 AC wifi Chipset mumimo and beamforning.with the standard Quantenna firmware, but extra added are
- Video optimisation when paired and seamless wifi chanel optimisiation
- video buffer
- Auto mode selection - when an eithernet cable is used on the extender, eg for Vodafone TV, they switch to Bridge mode to create a dedicated Wifi Bridge between router and end device. Otherwise they can operate as a wifi extender
- can pair up to 3 additional extenders back to the AP unit.
Their wifi chipset is as good as anything you'll see around.