+Fancy yourself a convergence fan? The Sonic combines two things you wouldn’t normally expect to find together: fitness band and Bluetooth headset. There’s a single colour OLED on top, notifications, incoming calls and the usual sensors. The core can be removed from the band at the push of a button — this converts it into a Bluetooth headset. In our tests, we found it to be comfortable and a capable fitness tracker — it has about 5-7% difference when compared to a Fitbit. It can also track your blood pressure, though it takes 2 to 3 minutes to do this. Audio is loud and clear and you should expect 3 to 5 days of battery life. The only issue is that it’s not waterproof, so watch out.