Hi Marceltt, the R8 has 750 watts continuous power 28mph top speed and a 37 volt 29ah battery, and retails for $12,990.
The R11 is no longer made and was replaced by the R15 which has 1500 watts continuous power, 2500 watts peak, 175nm of torque, a top speed of 33mph and a 46.8 volt 28ah...