Razer Nabu X Smartband &ndash; Black 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. All day wear Nabu X offers 5-7 days battery life, 30 days standby. Open development platform The Razer Nabu and Nabu X both share integrations with the same apps and innovations.