Since I don't have the equipment to test it, I'm selling it as junk. Everything is as shown in the photos. The following is an AI description: National PE-2003 strobe with a guide number of 20. - Brand: National - Model: 2003 - Guide Number: 20 - Compatibility: PE-2003 - Exposure Settings: 1.8, 2.8, 4, 5.6, 8, 11, 16, 22, 32, 40 Thank you for looking.