The Stanley Intelli Tools Smart Measure Pro measures length, area and volume and features a calculator function for instant adding and subtracting of measurements. It has Bluetooth connectivity to sync directly to a phone, tablet or computer and to transfer files in jpeg and pdf format. After attaching the Smart Measure Pro to a smart phone and connecting them via the Smart Measure Pro App, the user simply takes a picture of the required surface area, and the intelligent digital device automatically calculates the materials required. An essential tool for urgent jobs, it is designed to provide immediate calculations of specific material requirements preset within the application. It is powered by an internal lithium-ion battery and is supplied with a standard USB cable for charging. Free app is available for both Android ; IOS. Specification: Accuracy: 2mm.Operating Range: 145m.Power: Built-In Lithium-Ion ;Battery.