I had a fan-out problem where I only had a single POE+ ethernet cable going to a particular location and went from 4 devices to 5. There are very few POE+ pass-through switches with more than 4 ports (for good reason, described below), but the cameras only burn 5W each so I knew it would work if only I could find one. Got this little baby and it works great!Two side notes: First, DIN rail mounting, which is more industrial than consumer. Just get a cheap DIN rail to mount it to. Second, the ingress port was not clearly marked... which took all of ten seconds to figure out so no biggy there.These pass-through switches power their other ports from the POE+ on their ingress port. Usually you don't see more than a 1:4 fan-out, because the wattage constraints pile up very quickly when one tries to pass power through. Its great to be able to do though because satellite switches like this one don't need any additional power routed to them beyond that supplied by the ethernet cable from the primary POE+ switch... they just need the ethernet cabling.So I'll end with a word of warning and some data... this is an 803.bt switch, meaning that it supports the 100W spec instead of 803.at which is the 30W spec. Note that if your primary POE+ switch only does 803.at, it might not negotiate sufficient power for this 1:7 pass-through switch. There is a little handshake involved, so if the primary switch doesn't negotiate enough power, it won't work.My current primary switch is a NetGear GS308PP https://smile.amazon.com/dp/B082G2G2F8?ref=ppx_yo2_dt_b_product_details&th=1 . I had to flip its switch to the 130W setting to make it work with satellite pass-through switches (even lower powered ones). Though the power brick is only 90W, the switch setting worked. The whole system only pulls around 60W so all good. That's with 10 cameras, three 1:4 satellite pass-through switches, and this 1:7 satellite pass-through switch.Cameras typically burn 5 to 6W and WiFi base stations typically burn around 15W. Its good to have a Kill-a-watt meter on your primary switch so you can suss out the actual power consumption of your devices.Beyond that... plug'n play. It just works(!).-Matt