Huawei has a curious item on display at its Mobile World Congress booth this year: the TalkBand B1. Its a fitness tracker that pops out of its band and into your ear to act as a Bluetooth 4.1 headset. We couldnt try out the TalkBand as a Bluetooth headset, but were assured itll offer 7 hours talk time and standby of a week, even when using its fitness features. Huawei says youll also be able to use the built-in NFC to do things like check in and make payments without taking your phone out of your pocket.