Planet Technology Wireless USB Adapter WL-U350 - Manual (Page 18)

3.5 "Advanced
There are Preamble Type, Fragmentation Threshold, and RTS/CTS Threshold settings under
this mode.
Preamble Type (Short/Long): Preamble is the first subfield of PPDU, which is the
appropriate frame format for transmission to PHY (Physical layer). There are two options,
Short Preamble and Long Preamble. The Short Preamble option improves throughput
performance.
Fragmentation threshold: The size at which packets will be fragmented. Choose a setting
within a range of 256 to 2346 bytes.
RTS Threshold: Minimum packet size to require an RTS (Request To Send). For packets
smaller than this threshold, an RTS is not sent and the packet is transmitted directly to the
WLAN. This is the option for the RTS Threshold activation.
3.6 "Version"
It shows the current Driver, Firmware, and Application Version of this device.