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Vello FreeWave Plus Wireless Remote Shutter Release - 2.4GHz (for Sony Alpha) - Sony: Alpha 
 
Reduced Interference 24GHz Frequency  Range Up to 320 100 m  16 Possible Channels 
Built-In Internal Antenna  Press Shutter Halfway to Focus  Four-Second Delay 
Multi-Exposure Function  Control Length of Exposure Remotely  Works Wired or Wirelessly 
Change Release Cable fDifferent Cameras 
Whats In The Box Wireless Transmitter Wireless Receiver 2Camera Release Cables 4AAA Batteries 1-Year Limited Warranty