The range depends on the rider's weight, terrain and riding style, 80km range is a theoretical number. Real world range is between 50-60km depending on your riding style. If you want to compare boards, it's best to compare battery capacity in Wh.
The speed is determined by the gear ratio, the kv of the motor and the battery voltage. The board is designed for a maximum speed of 50km/h. The motors are powerful enough to go even faster, but we do not recommend changing the gear ratio for higher speed.
About the board
This is a high performance board and not a toy! If you don't have experience with e-boards this is probably not what you are looking for. This is a very heavy board and not ideal for traveling on public transport.