3. Studio flash panel integrates multiple functions, including: Stepless adjusted knob, can control the power output of 1/1--1/8; Optical control switch of three grades, respectively for high sensitivity, low sensitivity and off; Buzzer switch of three grades, respectively for BB, B, and off; Power input port, support voltage AC210V-230V/50-160Hz, built-in 5A fuse; The test button is used to detect the working state of studio flash; Sync port, can be connected with 6.35mm plug to accept SYNC signal; Power switch, used to control the power supply of the whole device; Three modes switch, respectively control the low brightness on/off and high.