An unexpected new player in the wearable space is Razer, an electronics company that's previously produced laptops, tablets, and gaming peripherals. Razer's wearable debut is a "smart band" called Nabu. The device pairs with a smartphone to display incoming calls and messages. It features two screens -- one on the top of the band and one on the bottom -- and contains an accelerometer and an altimeter to collect fitness data. The company touts other features on its website, like being able to alert the user when other Nabu users in their social networks are nearby. The device pairs with a smartphone via Bluetooth.