R4GS specification:

• Power supply: 2S-4S Lipo battery
• Operating current: less than 80-120mA.
• Distance: more than 400M on the ground.
• LED display: 128 * 64 resolution, LCD backlight.
• 10 memory storage modes
• Size: 213 * 117 * 115.5mm 

R6FG specification:

• Frequency: 2.4GHz ISM band (2400MHz ~ 2483.5MHz)
• Size: 35 * 20 * 13mm
• Channel: 6
• Model: cars / boats
• Modulation Mode: GFSK
• Spread spectrum: FHSS 10 memory storage modes
• Antenna length: 200mm
• Control distance: more than 400 meters
• LCD display: 128 * 64 resolution, LCD backlight
• Power supply: 4.8 ~ 10.0V dc
• RF power: <10dbm
• Channel resolution: 4096
• Working current: 30mA
• Compatible with transmitters: RC6GS, RC4GS, RC4G, RC3S, T8FB