TwinMOS G101

"TTI" and "50-WGRPR-P0A" appears to be silkscreened on the board in the FCC photos.

Specifications, per the FCC manual, follow...
 * Transmit Power
 * 17dBm @ 11Mbps
 * 13dBm @ 54Mbps
 * Receive Sensitivity (10^-5 BER)
 * -83 dBm @ 11Mbps
 * -67 dBm @ 54Mbps