From Manufacturer
The 300Ws Neewer Upgraded S101-300W Pro Studio Light recycles in 0.1 to 1.8 seconds and has a power range of 1/1 to 1/64. The electronics are cooled by a quiet fan while the 150W modeling lamp is dimmable from 10-100%. The light can trigger other S101s via master/slave mode where the triggered light mimics the settings of the master. The S101 has a built-in 2.4 GHz receiver and comes with a transmitter with a 328' range.