A growing number of companies are using the powerful Rockchip RK3188 ARM Cortex-A9 quad-core processor in small boxes designed to run Android apps on your TV. But many of those small boxes are so small that there’s only room for a few USB ports, a microSD card slot, HDMI output, and not much else. The Tronsmart MK908 is a pretty good example.
That 10/100 Ethernet jack can come in handy, since a reliable internet connection is useful if you plan to use this type of device to stream video from a shared network drive or play internet music or video. Like most devices of its type, the K-R42-1 also features built-in WiFi, but you can typically get a much more reliable connection over Ethernet.
Other specs for this box include ARM Mali-400 MP4 graphics, 2GB of RAM, and 8GB of storage. It supports 802.11b/g/n WiFi, Bluetooth 2.0, has a microSD card slot, 2 USB ports, and an IR port for use with the wireless remote control that comes with the TV box.
It has a 3.5mm headphone jack (which is surprisingly tough to find on this sort of device), an HDMI port, and an external antenna which should help boost WiFi performance.
The K-R42-1 runs Android 4.1.1 Jelly Bean, although it should support Android 4.2 as well.