Whistle, dog activity monitor, Whistle Labs, Inc., San Francisco, USA

Ladyada and Becky Stern take apart the Whistle activity monitor for dogs

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Whistle announced a new GPS device to make sure you never lose your pet. The new product, dubbed WhistleGPS, uses both GPS and sub-GHz cellular technology to add on-demand location monitoring to Whistle's flagship activity tracking gadget that syncs with iOS or Android devices. It's a logical addition, as Whistle's core product seems best suited for pet owners who aren't always physically with their dogs. The gadget, which is on presale now for $49, will retail for $129 with a $5 per month GPS service fee.

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Whistle offers accurate tracking, fast charging, but durability issues. Follow reporter Nick Barber on Twitter @nickjb

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Whistle GPS Pet Tracker combines an on collar device with a simple mobile app. Whistle allows you to track your dog's location, activity and health so you know they are always safe and sounds. Stay connected to your best friend from your smartphone from wherever you are.

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