Operating time : 10 hours with all laser beams on. Power source : 4 x AA(LR6) Not included. Operation temperature range:-10- +50. Storage temperature range:-20- +70. The item "5 Line Laser Vertical Horizontal Level Green Self Leveling 360° Rotary Measure" is in sale since Monday, September 18, 2017.This item is in the category "Home & Garden\Tools\Measuring & Layout Tools\Laser Measuring Tools". The seller is "dongbingbing2014bj" and is located in ShenZhen. This item can be shipped worldwide.