Echo Robotics mowers and ball pickers can both be programmed and work very quietly. Are you anyway afraid of disturbing players during certain hours? No need to worry! You can program your machines to work outside those time slots. They will automatically start at the desired times, without you having to do anything.
And if some areas of the driving range are more often covered with balls than others? You can work in multiple zones and plan for a more regular passage of your ball picking robots at those specific locations.