The Spektrum DX9 9-Channel DSMX Transmitter for RC Aircraft is a radio controller designed primarily for RC aircraft, including helis, airplanes, and sailplanes. The transmitter features a programmable voice alert function that can be programmed to alert you to a Switch Change Report or Stepping Event. It features memory spaces for 250 models, and there is an SD card slot for increasing memory capacity, transferring settings from other transmitters or a computer, and updating the firmware (card available separately).
You can bind the DX9 to a second transmitter, either hard wired or wirelessly, so that an instructor can quickly take over when necessary during a class. The transmitter is DSMX/DSMX-compatible and uses a 2.4 GHz-band radio. It features an internal charger for the removable 2000mAh 2-cell Li-Ion battery, please note the first time you charge a battery, expect it to take 12 to 15 hours. A blue LED illuminates when charging, and turns off when charge is complete.