The Goods: March 2013’s Hottest Gadgets

Tiny bluetooth earbuds, a TI-84 calculator fit for 2013, an app that coordinates your phone's audio settings with your daily schedule, and more

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This month, our top new gadget picks include a smarter bike trainer, a credit-card size USB charger, and a new Arduino controller for serious DIY gamers. Check out the gallery for more great ideas in gear.