Hi,
Just found this. Please ask us (YourDuino.com) if there's a problem with a product we sell; we are glad to TRY to help..
This unit has been very difficult to get complete information on.
We have quite a bit here: http://arduino-info.wikispaces.com/UltraSonicDisplay
Anyone have more?? Please let us all know!!
We have 3 or 4 low-cost options now:
Regards, Terry King
...In The Woods In Vermont
terry@yourduino.com