Amazon is refreshing its Fire-branded TVs with new models that promise to be thinner while also improving performance. Exact specifications weren’t given, but in the past, the TVs have used a lower-quality LED display that still offers 4K resolution. (Credit: Amazon)In addition, the company developed a new Amazon Fire TV Stick for people looking to upgrade their existing screens with a dongle. The $39.99 Fire TV Stick 4K Select stands out by featuring Amazon’s homegrown operating system, the Linux-based Vega OS, instead of the Android-based Fire OS. Also today, Amazon announced new Kindle Scribes, Echo devices, and Ring and Blink cameras.