Built-in 200mAh lithium battery: The laser measuring tool built-in with rechargeable battery for easy operation. Just use the charging cable to charge it. No need to buy extra batteries. With high precision 2mm (+0.1%/m) for more convenience for your work. Simple operation: 3 units of measurement M/IN/FT can be switched. Multiple measurements (area measurement, volume and Pythagoras addition/subtraction/area/volume/pythagoras measurement) and measurement mode selection (addition/subtraction/area/volume/pythagoras measurement) can be chosen to meet your daily needs . Built-in auxiliary laser vertical lines: Built-in auxiliary laser vertical lines, convenient for DIY. Larger backlit LCD display: The laser measuring tool has a Large backlit screen which can provide you with better visibility in dark areas. Durable and compact design: With an aluminum design and a weight of 61g, the laser measuring tool is compact and durable, very easy to transport and use.