A white biaxially oriented polyester film for use as a base film for receiving an ink jet printer image and a base film for receiving an ink jet printer image which satisfy the following requirements to : the content of titanium oxide particles having an average particle diameter of 0. This bulk group III nitride crystal is expressed as Gax1Aly1In1-x1-y1N and the seed crystal is expressed as Gax2Aly2In1-x2-y2N. A plurality of headsets are in two-way wireless communication with the base station. The port contains a working fluid for affecting the size of the restricted opening.