If you use Makita cordless tools, batteries are a major part of your tool budget. If you are concerned about battery theft, Sync Lock™ is for you. Makita Sync Lock™ is a theft-deterrent system that creates a strong incentive for your workers not to take batteries off the job site. Sync Lock™ disables operation and charging of Makita 18 LXT® batteries by programming a lock-out schedule which can be preset by day, time and calendar. After your initial investment in the hardware, there is no cost. Simply purchase the Sync Lock™ Battery Terminal and set up the software (included) on a computer or laptop – that's all you need to start using Sync Lock™. There is no added cost for Makita batteries compatible with Sync Lock™, as all Makita batteries with L.E.D. charge-level indicators are ready to use with Sync Lock™. Sync Lock™ works with Makita 18V LXT® Lithium-Ion 2.0Ah, 3.0Ah, 4.0Ah, 5.0Ah and 6.0Ah batteries equipped with L.E.D. charge-level indicators. The following battery model numbers are compatible: BL1802B, BL1830B, BL1840B, BL1850B, BL1860B.