The SDD

For a while now I have been contemplating an invention. I feel there would be enough support from families that it could help simplify hours of searching or days of waiting.

The device's name - the S D D for short or the Sippy Detection Device for long.

Yes the sippy cup detection device will help coral all those lost and wayward sippy cups filled with milk that can't find their way back to your toddler or the refrigerator.

We seem to have this problem where the sippy cup gets filled and carried to some part of the house - which is way better I guess than an open cup spilled?! Maybe?! Instead our sippy cups head out of the kitchen and sometimes living room for what is supposed to be a 3 hour tour and wind up stranded on some island. For example, this week. I KNOW I washed like 8 sippy cups on Monday so they were all in the kitchen. I filled 2 with milk. Only 1 could be found at dinner time. Each day I looked in closets, under the couch, in the toy box, etc. scouring the house for the lost (and hopefully not full of milk!) sippy. Sometimes this can happen two or three times in a day if dear old dad is around. So what do you think? What I see is something similar to "the Clapper". In fact it reminds me of a device that my friend Eric had on his keys. He kept misplacing his keys, so someone got him this thing which he attached to his key chain. Then, whenever he forgot where they were he just clapped loudly and if the keys were within reach of the clapping sound they emitted this horrible signal letting him know where he left them. He could then easily follow the ear-shattering signal to the location of his keys.
That is what I picture for the Sippy cup Detection Device. I'm serious about the amount of time I spend searching for these things. No amount of encouraging will get the sippy's back home. Sigh.
What do you think? Is it marketable?