This is the Elinchrom ELC Pro HD 500w Flash Head Only [20613.1]

The Elinchrom ELC Pro HD 500w Flash Head Only is evidence of the company's continued commitment to pushing the envelope in monolight design. Elinchrom has packed the ELC Pro HD 500 with professional features we've come to expect from a flash head of this calibre and added quite a bit more. Short recycling times coupled with fast flash durations make freeze-motion, stop-action shooting possible. In fact, up to 20 frames per second is possible at minimum power. An intelligent low noise, temperature-activated fan keeps the head cool and lengthens the life of both the flash tube and modelling lamp. A pre-flash detector lets you integrate your on-camera flash into your studio system.

Power, variable continuously from 7 to 500W/s, can be mimicked by the 300W proportional modelling lamp to preview your effects. Although Elinchrom provides one, you can swap the sync cord with a separately purchased 8-channel transceiver for wireless triggering from your camera. The head has one built-in to receive the signal. Flash modes allow you to address special situations. The Sequential Mode enables triggering up to 20 ELCs in bursts or in a continuous cycle. Delayed Mode offers a choice of first or second curtain syncing while Strobo Mode allows single frame stroboscopic action sequences. Finally, the auto-sensing multi-voltage power supply means that you can use the ELC Pro HD 500 anywhere in the world.

Features:
Built-in EL-Skyport receiver for triggering
EL-Skyport with 8 frequency channels with 4 groups
EL-Skyport Speed Sync mode for synchronization up to a 1/320 sec. on enabled SLR cameras
Intelligent pre-flash detector system to enable the use of ELC units with speedlights
8 f-stop range
Action-freezing flash durations of 1/2,330 @ full power (t0.5) and as short as 1/5,000 sec. at 53W/s
Stable even at fastest recycling times
Up to 20 flashes per second
Consistent colour temperature with +/-150K°,
Power Auto-dump
Multi-voltage auto-detection: 90-265VAC excluding modelling lamp
Low 5V sync voltage safe for all digital camera systems
Intelligent low noise fan spins slower or faster depending on the internal temperature of the unit
Impact resistant and fire retardant body shell
Accessory bayonet permits use of the complete range of light modifiers

Specification:
Maximum Watt/Seconds 500
Guide Number 212.6' (64.8 m) @ 3.3' (1.0 m), ISO 100 with 48°, reflector
Recycle Time At full power: @ 230VAC Slow: 2.0 sec., Default: 0.75 sec., Fast: 0.6 sec, @ 115VAC Slow: 2.5 sec., Default: 0.9 sec., Fast: 0.7 sec.
Maximum flashes per sec at min power: 20
Flash Duration Min/Max: 1/2,940/1/2,330 @ t0.5 At 53W/s: 1/5,000 (3.1 power setting)
Flash Variability 7.0 Stops: 7.0 -500W/s Power range display: 0.3 -6.3
Colour Temperature 5,500K
User Replaceable Flashtube Yes, S-Type, Omega plug-in
Changeable Reflector Yes
Modelling Light Wattage 300W
Modelling Light Control Full, Free, Proportional
Voltage Stabilization Yes, +/-0.1%
Flash Ready Indicator Audible and LED
Operating Voltage 90 -265VAC, 50/60Hz
Sync Voltage 5.0V
Sync Socket 3.5mm Jack
Umbrella Mount 7.0mm Diameter
Built-in Slave Cell Optical/IR
Integrated transceiver: 8 frequency channels with 4 Groups with full RX features
Circuit Protection Fuse
Power Consumption @ 230VAC, 50Hz, Slow: during charge: 350, Default: during charge: 700
Fast: during charge: 875, @ 115VAC, 60Hz, Slow: during charge: 250, Default: during charge: 500, Fast: during charge: 625
Pure Sine Wave Converter AC/DC, slow charge: 600 with halogen
Fan Cooled Yes, temperature-controlled
Auto Dump Yes
Dimensions 12.4 x 5.5 x 8.2'' (31.5 x 14 x 21cm) With protective cap
Weight 5.18lb (2.35kg)

Kit contents:
Mains Cable
Sync Cable
Modeling Lamp (300W)
Glass Dome
Protective Cap
Reflector (6.3''/90°,)
Limited 2-Year Warranty