What is the difference between the 3 different gateways available in our shop (G2, G3 Wired, G3 POE)?

Question 

What is the difference between the 3 different gateways available in our shop (G2, G3 Wired, G3 POE)?

Answer

Sifely G2 Wi-Fi Gateway Buy here

This is a wireless gateway that you need to connect manually via wifi, and this is required to be plugged in all the time. The gateway is plugged into an outlet.

Sifely G3 Wired Gateway Buy Here

This is a wired gateway that uses an ethernet cable that needs to be plugged into your router, which must be plugged in all the time. This gateway must be plugged into the router and a wall outlet. 

Sifely Gateway (POE) Power over Ethernet Buy Here

This POE gateway can get connection and power from a POE switch; you just need the ethernet cable to plug it into your POE Switch, which connects to your router. This gateway only needs to be plugged into the POE switch.

Note:

Ethernet cables and wall adapter are not included.