"* High-performance TTL Electronic flash, Completely compatible with Nikon i-TTL system* LED backlight Panel * Recycling Time：3s* Flash number：GN 50 * Support Nikon wireless flash system（ master/slave ）* Support wireless 【M】gourp SET flash Output * Support camera bome light / wireless TTL exposure lock* Support front-curtain sync,Rear-cutain sync* TTL Automatic exposure ，exposure compensation -3.0EV to +3.0EV* Temperature measurement* Locking pin* Manual flash、Multi flash * Low Battery indication"