"Bluetooth" wireless technology connects your LDM from "Stanley" with your smartphone and tablet. Calculates area and volume instantly. Take long mesurements without assistance (range: 4" to 100'), Take reliable measurements for estimating and space planning (accuracy: +/- 3/32"). Continuous measurement finds distrance from a target quickly and easily. Addition / substraction automaticaly calculates. Measuring units work in English, metric and fractional. Decimal modes. Limited lifetime warranty.