Thanks for the link Rory. I wanted to ask you Rory I've had a look on the link as research & wanted your advice on which out of N2LV, N2LVHP or N2HV nano speed controllers is ideal for the micro motors that got from BotBitz. The motors are BotBitz GM12 50:1 HV (BB-GM 12-50 HV) 5.0volts.