NAS is Nissin newly developed 2.4GHz radio transmission wireless flash system. To compare with the traditional optical wireless transmitters, 2.4GHz radio transmission is less susceptible to angle and obstacle limitation, coverage up to 30 meters. Transmission channels and radio transmission IDs can be set to prevent misfiring in the event of signal interference on the same channel. Nissin Commander Air 1 can control 3 groups of Nissin Flash Di700A with the user friendly operation panel and variety function, it would be more convenient for the user. Flexible combination of Nissin NAS. Nissin Commander Nissin Air 1 can be mixed to control different versions of Nissin Di700A for wireless TTL or manual flash. After Binding setting on Nissin Di700A and Nissin Air 1. You can control the flash TTL EV compensation/ Manual out put/ Manual zoom on Air 1 and all set to be displayed on Nissin Di700A at the same time. Nissin Air 1 has the AF assist light for shooting in dark environments.