Features: Up to 50m-100m distance anti-interference wireless control Advanced circuit design, low power consumption Multi-channel supports multi-user work at one time Working frequency 433MHZ, which is green and license free frequency around world Pocket size and easy control Hot shoe connection of the receiver Specifications: Power Supply: 12V/23A battery Average Life Span: 1 year standby or continuous press for 20,000 times (standy by >800h) QTY of Channel: 16 Remote Control Distance: 40-50m or 135ft Work Indicator: Double Color LED Indicator Wireless Frequency: 433MHZ B Shutter Setting: Long Press Over 3 Seconds Compatibility: Canon EOS 7D, 50D, 40D, 30D, 5D, 20D, 10D, 5D Mark II, 5D Mark ¢ó,1DMark IV, 1Ds Mark III,1D Mark III, 1D Mark II N, 1Ds Mark II, 1D Mark II, 1Ds, 1D, 1V, EOS 3, D2000,6D Package includes: 1 * Receiver 1 * Transmitter 1 * Shutter Connection Cable 1 * User Manual