Features 4 SPEED ADJUSTMENT: 1st gear 77 to 86mm/min, 2nd gear 115 to 121mm/min, 3rd gear 152 to 158mm/min, 4th gear 190 to 220mm/min, this glass glue gun offers the perfect speed for both professional engineering installations and home DIY projects. AUTOMATIC RETRACTION SYSTEM: The motor is equipped with an automatic retraction system to prevent leakage when the gun stops. When the trigger is released, the motor instantly reverses, releasing pressure on the tube. WITH LED LIGHT: The built in LED light at the barrel end is a great feature when working in attics, crawl spaces, garages, or other dark areas. It provides sufficient brightness to notice the flow and joints of the sealant. SMOOTHLY AND EFFICIENT OPERATION: With the lock button pressed during the glue stick advancing process, you can smoothly and quickly dispense a smoothly flow of adhesive. VERSATILE APPLICATIONS: This glass glue gun is suitable for various home renovations, kitchen countertop installations, shower product installations, floor repairs, and caulking. Specification: Item Type: Cordless Caulking Gun Material: ABS Battery: 20V lithium battery x 1 (shipped without battery) Working Current: 1A LED Light Current: 200mA LED Luminous Flux: 400 to 450LM Work Pressure: Approx. 250kg / 551.2 lb Working Time: 240 minutes LED Color Temperature: 6000 to 6500K LED Display Screen: 70 to 75Ra Suitable for Battery Interface: For BL1830B-2 BL1850-2 BL1850B-2 BL1840B BL1820B BL1860B-2 BL1830 BL1840 BL1850 BL1860 BL1815 BL1430 BL1450 BL1440, etc. Package List: 1 x Cordless Caulking Gun 1 x Manual  Package List 1 x Cordless Caulking Gun 1 x Manual