Canon TTL HOT SHOE ADAPTER 3, when placed in the EOS camera's accessory shoe, controls up to 4 off-camera Speedlites.

Compatibility

-- Speedlite 200E
-- Speedlite 540EZ
-- EOS Rebel 2000
-- EOS ELAN II
-- Speedlite 600EX-RT
-- EOS Rebel G II
-- EOS A2
-- Speedlite 220EX
-- EOS 1N
-- Macro Ring Lite MR-14EX II
-- Macro Twin Lite MT-24EX
-- Speedlite 480EG
-- EOS 1V
-- EOS ELAN 7 / 7E
-- EOS Rebel G
-- EOS A2E
-- EOS Rebel T2
-- Speedlite 420EX
-- EOS Rebel K2
-- EOS ELAN 7N
-- Speedlite 550EX
-- Speedlite 430EX II
-- Speedlite 600EX-RT Refurbished
-- Speedlite 580EX II
-- Speedlite 430EX Refurbished
-- EOS 3
-- Macro Ring Lite MR-14EX
-- Speedlite 580EX II Refurbished
-- Speedlite 430EX
-- EOS ELAN IIE
-- Speedlite 320EX
-- Speedlite 580EX
-- EOS Rebel TI