The ornamental design for a singlechargerunit for a communications device, as shown and described.
FIG. 1 is a top front left perspective view of a single charger unit for a communications device.
FIG. 2 is a bottom front right perspective view of a single charger unit for a communications device.
FIG. 3 is a top plan view of a single charger unit for a communications device.
FIG. 4 is a bottom plan view of a single charger unit for a communications device.
FIG. 5 is a front elevation view of a single charger unit for a communication device.
FIG. 6 is a right side view of a single charger unit for a communications device; and,
FIG. 7 is a left side view of a single charger unit for a communications device.
The broken lines shown in the drawings are included for the purpose of illustrating unclaimed portions of the single charger unit for a communication device and form no part of the claimed design.