Measured with Speedtest.net (real speed) the JRS Eco-wifi 01A offers 25 Megabits per second (Mb/s) while the JRS Eco 100 D1 and D2 models offer 400+ Mb/s. To achieve the maximum speed that your Internet subscription supports, you need to choose the Eco-wifi model that is at least as fast. These are real measured throughput speeds, not theoretical values like ‘AC1900’. You can find out your Internet speed on Speedtest.net.
The JRS Eco 100 D1 and D2 models are dual band, which means they emit at two frequencies: 2.4 and 5 Gigahertz. This allows for higher throughput speeds. You may turn off the 5 GHz if you want to minimize radiation.
The JRS Eco 100 D2 has detachable antennas, so you can reduce the range to just a few meters, and a wifi on/off push button on the side.
For more details see the JRS Eco-wifi product comparison table.