/usr/share/synce/synce-udev.rules is in synce-serial 0.11-5.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | ACTION=="add", DRIVERS=="ipaq", SUBSYSTEM=="tty", KERNEL=="ttyUSB*", RUN+="/usr/sbin/synce-serial-udev-add"
ACTION=="remove", KERNEL=="ttyUSB*", SUBSYSTEM=="tty", RUN+="/usr/sbin/synce-serial-udev-remove"
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