The main differences are the RJO70 uses Ultra Bright LED lighting, the RJO20 is a standard light. The RJO70 also comes with a backup battery and the RJO20 does not. Also, both the RJO20 & RJO70 have myQ connectivity but the RJO70 is Wi-Fi enabled and the RJO20 comes with a myQ device 828LM Internet Gateway which is a hardwired device the ethernet cord connects to. This would mainly be the differences between the two, the other functions and features are in both the RJO20 & RJO70, like the myQ system & power door lock. Chamberlain RJO20 weighs 31 pounds, and it works on AC/DC power input. It comes with a 5 Year warranty on parts, 1 Year accessory warranty, and a lifetime warranty on the motor and belts. Chamberlain RJO70 weighs 37.7 pounds, and it works on an AC power input of 120 volts. This model comes with a 1 Year manufacturer for accessories, 1 Year manufacturer for a drive, 1 Year manufacturer for parts, and 6 Year manufacturer for the motor.