Photo Studio Flash Light AC Slave Flash / Master Flash Power: 40W or 45W Triggering: Synchro inductor and test button Photo Studio Flash Light AC Slave Flash / Master Flash Power: 40W or 45W Triggering: Synchro inductor and test button Recycle Time: 8-10s Effective Distance: 10m Color Temperature: 5500-5600K Flash Duration: 1/1000 s Connection: General Screwed Holder or Lamp Socket.