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The Qflash TRIO by Quantum Instruments is a new flash system that combines Qflash head with built-in FreeXwire TTL radio and QTTL adapter for a digital camera. Qflash TRIO has all the same features as other Qflash models including: Manual, Auto, Auto-Fill, TTL, Strobo and Program (Pre-Sets) Modes. TRIO is powered by Quantum's line of Turbo battery packs.