• Powered by an Extreme Li-Ion Battery
• Fast recycle time of 1.5 sec (4x faster than AA power)
• Up to 600 shots at full power
• Up to 1000 shots at 1/2 power
• Built-in 2.4GHz wireless receiver & transmitter
• Unique wireless connectivity    
• High performance 60GN at ISO 100, 200mm
• TTL, Manual & Multi Modes
• Firmware update via integrated USB

Kit Includes:
MODUS 600RT MK II Speedlight
Viper TTL Transmitter
1 x HLX-MD1 Extreme Battery
USB powered MD1 MK II Ultra-compact Charger
USB cable