Compatible with Sony ADI / P-TTL, Guide Number: 190' at ISO 100 and 200mm, Tilts Upward 90°, with Bounce Panel, Rotates Left & Right 360°, 1.5 Second Recycle Time, HSS, 1st & 2nd Curtain, Multi-Flash, Included Rechargeable Li-Ion Battery, 2.4 GHz Wireless Transmitter / Receiver. Comprising the key items you need for dynamic off-camera lighting the Modus 600RT MK II Wireless Kit for Sony from hahnel pairs a 600RT MK II speedlight with a Viper 2.4 GHz transmitter compatible with its integrated radio system. The Viper transmitter retains full ADI / P-TTL metering with Sony cameras for easy exposure but also allows manually control of output levels for up to three groups of lights. Trigger distances of up to 328' are possible making for an uncomplicated workflow whether you are shooting in the studio or on location.