Pairs of matching connectors are described. The matching connectors can provide power to a powered device and/or communicate signals to a device. The matching connectors can include electrical contacts. In one example, the electrical contacts may be ring-shaped and several electrical contacts may be concentrically positioned. In one example, the matching connectors can be held together by a locking future that can be a magnet located in one or both of the matching connectors. In one example, the matching connectors can be connected by the angular of one of the connectors relative to the other. This rotation of one of the connectors relative to the other can engage the contacts of the connectors.