1、Versatile Compatibility: Designed for 10oz/300ml hard adhesives and 20oz/600ml soft adhesives, this cordless caulking gun is compatible with acrylic, adhesives, sealants, and other materials, catering to various caulking, filling, and sealing needs 2、Non Dripping: Equipped with user friendly anti drip function, this caulking gun automatically retracts the plunger when the trigger is released, preventing messy drips or overflows. This eliminates the hassle of cleanup and allows for better caulking results 3、Stepless Speed Adjustment: Featuring stepless speed adjustment knob, this 21V electric caulking gun allows for precise control over caulking flow and dispensing speed, enhancing efficiency and versatility from delicate manual caulking to covering larger floor gaps 4、High Efficiency: With a high performance 550 motor operating at 20000-22000RPM and a maximum thrust of 2646N/270kg, combined with expandable spring, this caulking gun ensures smoother flow without clogging. The aluminum alloy body ensures comfortable grip and preventing arm fatigue even during extended work 5、Long Endurance: Equipped with two 2000mAh high capacity battery (one primary and one spare) and a fast charger, this electric caulking gun can operate continuously for up to 5 hours under no load and up to 4 hours under loaded condition, ensuring prolonged use without interruption Item Type: Cordless Caulking Gun Applicable Range: 300ml Various Hard Adhesives; 600ml Various Soft Adhesives Motor: 550 High Performance Motor Motor Power: 45W Motor Speed: 20000-22000RPM Battery: 2 x 21V 2000mAh Rechargeable Li Battery (included) 2 x Cordless Caulk Gun 2 x Battery 1 x Adapter 1 x Piston 1 x Nut 1 x Nozzle 1 x Storage Case