The FS-i6S transmitter and FS-iA6B receiver constitute a 10 channel 2.4GHz AFHDS 2A digital proportional computerized RC System. This system supports quadcopters. The AFHDS 2A (Automatic Frequency Hopping Digital System Second Generation) developed and patented by Flysky is specially developed for all radio control models. Offering superior protection against interference while maintaining lower power consumption and high reliable receiver sensitivity.