Vello FreeWave Plus Wireless Remote Shutter Release - 2.4GHz (for Canon) Frequency: 2.4 GHz | Range: 320' | Channels: 16 Built-In Internal Antenna | Dual-Function Release | Four-Second Delay Function Multi-Exposure & Long Exposure Modes | Works Wired or Wirelessly LED Indicators | Each Device Runs on Two AAA Batteries In The Box: Wireless Transmitter, Wireless Receiver, FreeWave Camera Release Cable for Select Canon, Pentax, Samsung Cameras, FreeWave Camera Release Cable for Canon Cameras with 3-Pin Connection, 4 x AAA Batteries, 1-Year Limited Manufacturer Warranty.