the mower s also cause the degree of directional change to be approximate electrical circuitry found on each mowing device permits the device to operate only during periods and or in areas of predetermined levels of solar intensity i e devices will not operate at night or at times and in locations of predetermined unacceptably low solar intensity to effect the repeated and unattended cutting of a selected region of grass the selected region is first reviewed and subsequently bounded by man made or naturally occurring obstacles for example in locations where the selected mowing region is not naturally bounded by trees shrubs or the like a simple boundary of plastic wood stone or other material of users choice would be placed at the desired mowing limits the user of the system would then select the desired height of grass to be maintained it must be noted here that due to the low power and thus the inherent safe nature of the herein invention cutting device the region of grass to be maintained must be in a previously cut condition upon bounding of the to be mowed region and selection of grass height the user would place one or more of the cutting devices within the mowing region and bring it them into operation by turning on the main power switch 199 on each device at this time the mowing system is complete and will operate without further user intervention i normal operation mode in which the cutting device s is in motion cutting grass and responding to obstacles within and on.