www.vishay.com WK2, WR4, WR5, WK8 Vishay Draloric.
WK8588-AC - Wireless Mouse Transmitter controller
WK8 - High Power Metal Oxide Leaded Resistors
WK8588-PC - Wireless Mouse Transmitter controller
WK8588-HC - Wireless Mouse Transmitter controller
WK8588-EC - Wireless Mouse Transmitter controller
WK8588-PCL - Wireless Mouse Transmitter controller
WK8588-LQ - Wireless Mouse Transmitter controller
WK8588-RC - Wireless Mouse Transmitter controller