POE switch is not for everyone
This would be useful if you need to power up two IP cameras at a remote location that only has one cable going back to your server. Your main switch will need to have PoE too, to power up this switch. Don't forget to make sure you'll still be within the port power limit after hooking up the two cameras and switch.
You wouldn't typically get this as the main switch for your IP cameras as you need an existing PoE switch, and this only adds (splits) one extra PoE port.
Thanks eug for the explanation
$39 is a decent price I believe
Only 2 PoE ports by the look, and there's this.