Lsgoodcare 2 Pin Covert Acoustic Tube Earpiece Headset Mic for Motorola Radio Security Door Supervisor Power plug: 2.1mm x 5.5mm Great for applications where you need to install a wireless access point, but a power plug is not available or very far away from where the wireless access point must be installed Simply extend the range of Ethernet devices without a separate power cable Light weight, easy to bend, easy to install Suitable for all sorts of different devices such as IP phones, IP cameras, wireless LAN access points and so on