Radio sync & remote control in a small and lightweight unit. Mounted on the accessory shoe and protected by a very solid plastic housing. The transmitter has a minimum battery life of 1 to 2 years. Sync times (depending on camera type): 1/250 s for focal plane shutters, 1/800s for leaf shutters. 3 different channels and ALL (master channel), to prevent interferences between different workgroups within the same studio. Range of up to 30 m Sync cord included.