ADJUSTABLE SPEED CONTROL FOR PRECISION WORK: Take full control of your application with six precise speed settings, allowing you to regulate flow from 0 to 21 inch per minute. The robust 6500N output ensures smooth, even caulk beads, while the extended barrel design reduces strain by minimizing the need to bend during use PROFESSIONAL DRIPLESS DESIGN FOR A CLEAN JOB: This professional-grade cordless caulk Machine features an automatic anti-drip function. After you release the trigger, the plunger retracts slightly to prevent messy oozing and waste of adhesive, keeping your workspace clean LONG-LASTING CORDLESS POWER: Powered by a reliable 21V lithium power pack, this tool offers outstanding cordless freedom. It fully recharges in just 2 hours and can dispense approximately 100 standard tubes of caulk on a single charge, supporting extended project time VERSATILE FOR MULTIPLE PROJECTS: This adhesive machine is compatible with standard cartridges of silicone sealant, glass glue, and construction-grade silicone. (Please note: it is not designed for direct use with bulk glue). It is perfectly suited for tasks such as grouting tile seams, bathroom sealing, wall crack repair, fixing household leaks, and installing doors, window, ceilings, or curtain walls Service: We are very sorry for the shopping experience you have experienced. If you have any problems with the goods you received, please contact us and we will serve you 24 hours a day.