Razer Nabu X Smartband - White Discreet notifications- The Razer Nabu X offers a no-screen, no-fuss notification interface, meaning you keep your head up and in the game at all times. Stay active- All tracked by Nabu X's accelerometer and algorithms, with progress displayed on the companion fitness app of your choice. Band together- Nabu X is a social wearable, outfitted with Razer's proprietary Pulse technology to allow Nabu and Nabu X bands to "talk" to each other in a specified proximity.