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.

FEATURES: Six model 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, see COMMENTS).

SPECS:    Receiver-R146iP, 

            Type: Single conversion
            Length: 28.7mm (1.12")
            Width:  42.7mm (1.68")
            Height: 20mm (.079")
            Weight: 16.5 grams (.58 ounces)
            Receiving range: 300 meters (984 feet) Range will differ with the
              surroundings
            Power requirement: 4.8V-6V

         Servos- (2) S3110
            Length: 0.9" (21.8mm)eg @ 4.8V
            Width: 0.4" (11mm)
            Height: 0.8" (19.8mm))
            Weight: .26oz (7.3g)m)
            Speed @ 4.8V: .10 sec/60°
            Torque @ 4.8V: 22 oz-int:  0.90" (23mm)