This 2-conductor barrel style Power Plug is offered in the popular 2.1mm (I.D.) x 5.5mm (O.D.) size. It is compatible with many A/V products. For example, it will fit the power input on the the Oracle Diversity system, as well as many A/V transmitters and receivers.

 

The plastic finger grip screws off to reveal the two connections. Adding your wire requires basic soldering skills.