JJC QTS-4 Power Connection Cable for PENTAX AF-540 FGZ AF-500 FTZ Vivitar 3900 Flashes with Quantum Instruments Turbo Series Battery Pack as Quantum CN3 Designed for Quantum Instruments Turbo Series Battery Pack with PENTAX and Vivitar flash Dedicated Module (Connection Cable) Power PENTAX AF-540 FGZ, AF-500 FTZ and Vivitar 3900 Flashes with Turbo Series Battery Pack Replaces Quantum CN3 connection cable Cord length: 2meters