System: Infrarred communication used to control triggering and flash duration of secondary speedlights
Usable speedlights: SB-28, SB-27, SB-26, SB-25, SB-24, SB-23, SB-22s, SB-22, SB-21B, SB-20, SB-16B, SB-15
Function: Provides wireless TTL control of secondary speedlights
Effective range: Approx. 23 feet in AUTO mode, approx. 131 feet in Manual mode
Tripod socket: Provided
Accessories provided: Diffuser for built-in speedlight, soft case SS-SU4
Dimensions: 2.5 x 2.1 x 1.1 in.
Weight: 2 oz.