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The Spot does that too, it blinks red until the message has been sent, sometimes it might take a while but it won't change back to green until the message has gone through, so you know it's gone...

Have used one for the past five years, works good, you can preset the messages online so I have mine to say "Hi, the day day is over and we are safely at camp" and the other one says "Hi, we may be...