The Hahnel Modus 600RT Mark II is a powerful camera speedlight flash that features built-in 2.4GHz wireless receiver & transmitter functionality, TTL, HSS/FP-Sync and a fast recycle time of 1.5 sec. The flash is powered by an included 2000mAh HLX-MD1 Extreme lithium ion battery. This provides the speedlight with a 4x times faster recycling rate of 1.5 seconds; offering up to 600 shots at full power with slightly more flashes than its predecessor; and reliable power, thanks to high quality Li-ion cells, high energy density ratio, and excellent voltage stability.

Other functionality incorporated includes a High-Speed Sync of up to 1/8000th second shutter speed, a flash output that can be adjusted when used in TTL mode, Digital Channel Matching for integration of other hahnel products. In addition, the flash coverage can also be set automatically or manually from 20 to 200mm; and also supports optical wireless connection with other 3rd party flash units. The Speedlight flash Wireless Kit includes a Viper TTL Transmitter to trigger the Modus 600RT wirelessly.