The ornamental design for a portablewirelesskeyboard, as shown and described.
1. Portable wireless keyboard
1.1 : Perspective
1.2 : Front
1.3 : Back
1.4 : Left
1.5 : Top
1.6 : Bottom
1.7 : Perspective view
1.8 : Left view showing the folding state
1.9 : Left view showing the completely folded state
1.10: Claimed design in a state of use
The broken lines depict portions of the portable wireless keyboard that form no part of the claimed design; reproduction 1.1 is a front perspective view of the portable wireless keyboard; reproduction 1.2 is a front view thereof; reproduction 1.3 is a back view thereof; reproduction 1.4 is a left view thereof where the right view is a mirror image; reproduction 1.5 is a top view thereof; reproduction 1.6 is a bottom view thereof; reproduction 1.7 is a front perspective view thereof showing the folded state in the form of a bar for easy carrying; reproduction 1.8 is a left view thereof showing the folded state of the claimed design; reproduction 1.9 is a left view thereof showing the state in which the claimed design has been completely folded; reproduction 1.10 is a perspective view thereof showing an example of use state of being folded and put in a portable pouch etc. for carrying; this design is for a portable wireless keyboard which can be folded into a slim bar shape as shown in reproductions 1.7, 1.8. and 1.9.