Runners, cyclists and other outdoor fitness enthusiasts are probably familiar with ANT+, a data-streaming technology that allows sensors like heart-rate monitors and bike speed or cadence sensors to communicate with something capable of displaying the data, like a watch — or a phone.
Problem is, only a very few handsets, like the Sony Xperia Ion, come standard with ANT+ technology built in. That’s where the Selfloops adapter comes in handy, allowing all those fitness sensors to talk to your phone — and it doubles as a massive 2000 mAh battery as well.