Anyone using wt-5
I am not sure about the d4 but the same device is available font the d600 and it requires a mobile app to run on your iPad or smart phone. The app is free and can be downloaded from iTunes.
sorry - I have no information on your other questions.
|Carla... by lickity split|
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|Lunar New Year Fireworks by Michael L NYC 99|
|Vatican Basilica by wam7|
from Street lights