Include a GPS watch and the words Sentinel Watches. http://www.ebay.com/itm/Smartwatch-ZGPAX-PG88-Outdoor-Kids-GPS-Tracking-Baby-Pet-Anti-lost-Travel-Watch-/321777087275 that is the product. Maybe stylise that watch to include in the logo.
Reference Samples：
#14 by karjen is selected as the contest finalist!10 years ago
#4 by akilis13 is selected as the contest finalist!10 years ago
#28 by ingepro is selected as the contest finalist!10 years ago
Design Concepts Completed10 years ago
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ingepro