PoE and PoE+ allow normal CAT5e (or above) Ethernet cables to carry power to a device so that it doesn't need to be connected separately to the mains. Learn all about Power Over Ethernet is just 5 minutes! Links: TP-LINK Gigabit PoE Injector - Ethernet Cable - MikroTik Audience - Note: These are affiliate links. Introduction to Android app development: Let Me Explain T-shirt: Twitter: Instagram: #garyexplains