Top gadgets at Mobile World Congress

A host holds a mobilephone used to lock a Bisecu Smart Bike Lock on a bycicle at the Mobile World Congress (MWC), the world's biggest mobile fair, on February 26, 2018 in Barcelona. the Mobile World Congress is held in Barcelona from February 26 to March 1. / AFP PHOTO / Josep LAGO

From headsets that help you lose weight without dieting to a smart meat thermometer, here are five eye-catching devices on display at the Mobile World Congress, wireless industry's biggest conference which got underway Monday in Barcelona. 

Smart bike lock