SP Studio Systems Mini Slave Flash, Battery Operated Strobe with a Guide Number 50 ft. / ISO 100.

• This flash has a "diamond cut" case design which allows it to be positioned at any angle. The total number of flashes is about 260 with a fresh set of batteries. Recycling Time of this mighty little strobe is 8 seconds. Although compact in size, the guide number is a powerful GN 50 ft/ISO100, or GN30 ft/ISO100 with the diffuser in position. Angle coverage is 40 degrees horizontal x 55 degrees vertical. A versatile giant in a compact size: 2.5" x 2-3/8" x 1-3/8".