Best known for producing tech for gamers, Razer surprised a few people at the start of the year when it unveiled the Nabu smartband, a wearable that made such an impact it ended up picking up several awards. You’re right, a considerable amount of time has passed since then, and this particular space in the wearables market is filling fast with an array of devices, but for the patient types who’ve been hanging on for the Nabu, the news is positive – the gadget officially goes on sale in North America on Tuesday .