The price is for one device and comes with a one year protection. 
With the legendary ESET NOD32 engine at its core, ESET NOD32 Antivirus provides essential defense against malware, built on ESET's trademark best balance of detection, speed and usability. It offers Gamer Mode for lightweight protection while gaming, and the latest edition includes a host of under-the-hood improvements, including protection against script-based attacks.