 "Canon Speedlite 600EX II-RT"@en II-RT 1177C002 - Studio Depot"@en
"
Effective flash range of 2.3 to 77.4'
Exposure compensation of ±3 EV in 1/3 or 1/2 step increments
Light Distribution settings allow for Standard, Guide Number Priority, and Even Coverage
Radio master and slave functionality 
Use in up to 15 flash setups
10 custom Functions and 8 personal Functions 
LCD panel on rear for viewing and changing settings
AF assist beam with range of up to 13.1'
Fresh batteries will provide approximately 180 full-power flashes
"@en 
 Compatible Cameras Type-A EOS cameras (E-TTL II/E-TTL autoflash) Type-B EOS cameras (TTL autoflash)  Guide Number Approx. 49.2 ft/15m at ISO 100 Number of Flashes Approx. 100 - 700 flashes Recycling Time Nominal Flash: 0.1 - 5.5 sec Quick Flash: 0.1 - 3.3 sec  Flash Range Effective flash range with EF 50mm f/1.4 lens at iso100 Normal: Approx. 1.56 - 91.2 ft/0.5-27.8m Quick Flash: Approx. 1.6 - 48.6 ft/0.5-14.8m High-Speed Sync: Approx. 1.6-48.2ft/0.5-14.7m  AF Assist Beam Infrared AF-assist beam TTL second image formation phase-difference AF Support 1-65 AF points Phase-difference AF during viewfinder shooting Quick mode during Live View Shooting or movie shooting Effective Range: At center: 2.0 - 32.8 ft/0.6-10m At periphery: 2.0-16.4 ft/0.6-5.0m  Custom Functions 15 Functions 6 Functions  Power Source Four AA-size/LR6 alkaline or AA/HR6 Ni-MH batteries External Power Source Compatible (Compact Battery Pack CP-E4N recommended) Dimensions 3.10 x 5.64 x 4.83 in/78.7 143.2 x 122.7mm Weight Approx. 15.34 oz/435g
 "Polycom Miscellaneous Accessories" "1530-29756-001: Polycom (1530-29756-001) - Accessories 1530-29756-001"
"Replacement Lamp Module for RPX Series" 