Yongnuo Upgrade Rf-603 Ii C1 Flash Trigger/Wireless Shutter Release Transceiver Kit For Canon Rebel 300D/350D/400D/450D/500D/550D/1000D Series
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2, Adding the Locking rings
3, Improved Flash / Shutter control Buttons
4, Working for more non Canon/Nikon cameras and single firing pin cameras --- ALL Standard Hot shoe DSLR Camera except Sony and Minolta.
5, Adding the power switch for single transmitter --- Set the power switch on TX (single transmit) or TRX (transmit-receive automatic switch) state according to different shooting requirement. When it used as wireless triggering transmitter and flash testing, set to "TX"; When it used as wireless triggering receiver, using shutter release or other extended functions, set to "TRX". set to OFF means turn off the power.