[4 Gear Adjustable Speed]The caulking has four gears of variable speed, the pushing speed can be adjusted from 0 to 196mm/min. The variable trigger can also control the flow rate, The corresponding flow rate can be according to different needs, which can better control the flow of glue. [Automatic Rebound Design]When you release the trigger, the toggle automatically rebound to prevent excess glue from dripping out. [LED Light Design]With an 450LM LED light, provide light for use in other dark environments. [Widely Use]Suitable for applying glass glue, caulking, sealant etc. This caulking is suitable for all common 10oz/300ml sealants. Widely used for filling, sealing and repairing some narrow gaps in walls, , balcony doors and , shower/wash basin installations etc. Specifications: Voltage:18V/20V Max Working Current: 1A LED Lumens:400-450LM Material: Plastic, Iron Glass Glue Type: Structural Glue and Filling Glue Battery Model: Li-ion Battery(Battery Not Included) Suitable For 18V-20V MAX Li-ion BATTERY MODEL: 18V: BL1815 BL1820 BL1830 BL1840 BL1845 BL1850 BL1860 and so on. Color: Blue Package Contents: 1 x Electric Caulking Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.