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: Sony A99, A560,A580,A290,A390,A450,A55, A33, A500, A550, A850, A900, A350, A300,A200, A700, A100 ,A77,A65,A35,A390,A290 Package includes: 1 * Receiver 1 * Transmitter 1 * Shutter Connection Cable 1 * User Manual