Here are the differences between the 6EXA and 6EXAS:

1. The front panel is manufactured differently.
2. The LCD is different.
3. You can name your models up to 4 characters.
4. It has aileron differential.
5. It has flap trim.
6. It has adjustable mixing rates on V-Tail and elevon.
7. It has adjustable mixing positions for throttle cut.
8. It can be switched from FM to PCM.
9. It has Failsafe in PCM mode only.

This radio is diode protected to prevent overcharging, which means the battery cannot be discharged through the transmitter.

This model has six memory with four character model naming. Standard programming features include all channel servo reversing, End point adjustment (EPA) on all channels, dual rates, exponential flaperon, V-tail, elevon, and wing type selection. Transmitter controls include Throttle Cut Switch-stops engine when flipped twice within one second, Trainer Switch-controls link between instructor and student transmitters, Retract Switch-controls operation of retractable landing gear or other feature, Dual Rate Switch-reduces servo travel and switches' exponential curve. Flap dial control allows fine tuning of flap servo to slow airplane when coming in for a landing. Adjustable flaperon rates. Adjustable stick length. Digital Trims. Modulation PCM/PPM (FM) selectable. Trainer box capable (trainer cord sold separately.

One Futaba 6EXA Super Computer Radio system with:
Transmitter Crystal
R146iP Micro Receiver with crystal
Two S3114 micro servos
NT8F600B Transmitter battery
FBC-19B (4) Charger
SWH-15 Mini Switch Harness
ANT-5 Transmitter Antenna, are all included in this product.