The DEWALT DW055PL Pocket Laser Distance Measure has a compact design which easily fits into a pocket, so its always easy to reach. One button design allows for simple operation. The black screen with white digits/letters provides better visibility in brighter conditions. It calculates distance in Metric and Imperial. Powered by a 3.7V lithium-ion battery providing up to 1000 measurements per charge. Easy recharging via USB port, it takes 2.5 hours to fully charge from empty. Specifications: Accuracy: 6mm/m @ 10m.Operating Range: 16m.