Output power: 300ws Flash guide No.: 55GN Output control range: 1/32~1/1 stepless power control Halogen modeling lamp: 150w Recycling time: 0.8~2s Color temperature: 5600K~+/-200K Flash duration: 1/800~1/1200s Modeling light working mode: full power output/proportional flash and modeling light Flash output precision: +/-0.1EV Recycling indication: LED/Buzz/Modeling light indication Working voltage: 170~240V automatic voltage regulator circuit Flash triggering method: photocell/sync cable/test button Triggering voltage: 5v low voltage trigger Cooling fan: yes Technical speciality: flash auto purge function