Commercial grade robotic lawn maintenance equipment. Must include: Geo positioning technique that enhances the precision of position data derived from satellite-based positioning systems. Satellite guided to allow no boundary wire installation. Navigation capability to ensure mower navigates with precision around each challenge the terrain presents, including but not limited to headstones. Technology capable to determine the most efficient path to complete in each zone of coverage. Technology to operate multiple robots in the same area. Vendor within 100 miles proximity to provide quick support response time for units and software. Capability to operate on 40-degree slopes. Quiet operation, 65 (dB) max, as to not disrupt interment proceedings. Methodical coverage in parallel lines for maximum mowing efficiency. Protection coverage for each mower from various weather conditions. Specifications: Area performance: 3 - 4 ½ acre; Cutting width: 13.0 – 14.0 in. Cutting height: Should be within 1.0-4.0 inch range; Minimum average running time: 80 minutes; Minimum average charging time: 84 minutes; Mowing speed: Up to 2.0 ft/s; Blade motor: Brushless; Dimensions: preferred not to exceed 30.0 x 21.7 x 12.8 in. Weight: 50 lbs. or less. Quantity: 4