4 Measuring Modes : : Press the "FUNCUNITS-1" key to switch the mode of tape measure, followed by area measurement, volume measurement, Pythagorean measurement, Pythagoras measurement to satisfy your all needs. 2 in 1 Measure Tool : : This tape measure includes two mode-131ft/40m measurement and 16ft/5m AutoLock tape measurement. Press the "" button of this measuring tape 2s to switch units among M / In / Ft freely. USB Rechargeable : Built-in 180mAh lithium battery and USB port ,the tapes can be rechargeable via USB cable.Can be used 3000 times for 5 hours when fully charged. High Precision : : 40m/131ft, measurement accuracy: +/- 3mm,It's available to operate continuous measure, accurate distance can be read within the effective range while moving,Class II production less than 1mW power output. waterproof Dust proof: Ip54, body size: 8.5 x 4.3 x 7.5cm, real weight: 280g. Compact & Powerful : Just turn on the switch and press the operation button to instantly measure the distance accurately and operate easily. Fits in your hand, has an easy-to-read LCD display, and can be used in dark places and rain. The simplest professional rangefinder.Idal fits for DIY, construction,home decoration.etc.Colour: blackMaterial: ABSPackage Contents:1 * Metric tape measureOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.