When under manual control safe start ensures that the superbug is extremely course friendly. Safe stop under remote mode brings the trolley to a haly if it has not recieved a command within the previous 25 seconds. In both manual and remote modes, cruise control ensures that a constant speed is automatically maintained without the need for constant manual adjustment.High quality 6061 aluminium chassis delivers exceptional strength and rigidity with light weight Measuring 77cm*59cm*28cm folded and weighing only only 23.3kg including the batteries.