We caught a glimpse of Sonys Core activity sensor back at CES, and it seems the masses will be able to outfit their wrists with one this spring. At Mobile World Congress, Sony announced that the SmartBand (SWR10) that houses the Core and its accompanying Lifelog app will be available in March. If youre in need of a refresher, the Bluetooth and NFC-compatible activity tracker is waterproof with a micro-USB port and will arrive in only in Black… initially.