1、Adjustable Speed Settings: Four speed options, 1st gear for 77 to 86mm/min, 2nd gear for 115 to 121mm/min, 3rd gear for 152 to 158mm/min, 4th gear for 190 to 196mm/min. Offer versatility for professional engineering installations or home projects, ensuring the perfect speed for every task. 2、Motor with Automatic Retraction System: Prevents leakage and ensures cleanliness by immediately reversing motor upon trigger release, releasing pressure on the tube. Ideal for maintaining workshop cleanliness. 3、Variable Speed and LED Light: Four adjustable speeds for accurate control and efficient handling of adhesives and sealants. The built in LED light at the barrel end enhances visibility in dark spaces, facilitating seam and flow monitoring. 4、Smoothly Application Process: Press the lock button during glue stick advancement to maintain steady application, allowing for quick and smoothly dispensing. Achieve high work efficiency in professional settings with the four speed option, completing a glue stick in approximately 2 minutes. 5、Versatile Applications: Cordless caulking gun is ideal for home renovations, kitchen countertop, shower installation, and caulking. Compatible with all standard 10OZ 300ml sealants and cartridges. 6、Applicable Battery Model: Electric caulk gun is suitable for BL1830B 2 BL1850 2 BL1850B 2 BL1840B BL1820B BL1860B 2 BL1830 BL1840 BL1850 BL1860 BL1815 BL1430 BL1450 BL1440, etc(without).