The main difference between the 3 models is the wifi speed. The JRS eco-wifi 01A offers 25 Megabits per second (Mb/s), the 03 model offers 100 Mb/s, and the 05AC model offers up to 350 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 as that. You can find out your internet speed on Speedtest.net.
The 03 and 05AC models are dual band, which means they emit on two frequencies: 2.4 and 5 Gigahertz. This allows for higher throughput speeds and for mitigating interference from neighbouring wifi routers. You may turn off one of these if you want to minimize radiation.
The 01A model’s hardwired LAN ports have a maximum speed of 100 Mb/s while the 03 and 05AC models have 1000 Mb/s ports.