If there's one product category that seems to be getting a lot of attention lately, it's Bluetooth trackers. These are the little devices that you drop into a bag or attach to a camera that link with an app on your iPhone and then tell you when the two are separated by a certain distance. I've tried a ton of Bluetooth trackers, and frankly all of them have had one fault or another: no replaceable battery, inability to connect more than one tracker to an app, and so on. That's why I was interested in trying out the Duet by PROTAG (US$19), billed as a third-generation Bluetooth device for keeping an eye on your valuables.
This product is actually an Indiegogo-funded project that is well on its way -- 1,244 percent of funding with 11 days to go. The Duet is a tiny 2.8 cm square object that is made out of bright plastic (orange, yellow, green, blue, or white -- there is a "founder's black" version available, too), just big enough to hold a standard replaceable CR2016 battery. Innova Technology -- the product developers -- includes two batteries in the package, each lasting about eight months before needing replacement. The replaceable battery is a great idea -- you don't have to throw out the device once the battery dies, nor do you have to plug in the Duet to recharge it.
Setting up the Duet is a piece of cake. You open it up with a fingernail, drop the battery in, and three red LEDs begin to flash. Open the PROTAG app (free), set up a free account (either with your email address or Facebook), and follow some simple instructions, and the next thing you know the app and tag are talking to one another.
Walk more than 10 meters (32 feet) away from the tag, and your iPhone will start buzzing to notify you that you're leaving something valuable behind. And if you have the Duet in your hand and can't find your iPhone, just push the single button on the device and your iPhone will start buzzing so you can find it. You can also force a search for the Duet from your iPhone by opening the app and tapping "buzz".