This heavy-duty vacuum sucker is a must-have tool for lifting and positioning various materials. Generating over 28 inches of mercury vacuum power, it can securely hold items weighing up to 440 pounds without the need for cables. Featuring extra-large 8-inch suction cups made of durable silicone, this vacuum sucker provides a wide gripping surface to comfortably support everything from fine tiles to heavy slabs. Its battery-powered design allows for maximum mobility and flexibility during installation projects. An auto-release function also protects the user by preventing damage if suction is lost, making this vacuum sucker safe to use on a variety of surfaces. Whether transporting backsplashes, window glass or granite countertops, this cordedless lifting tool will save your back from the heavy lifting while ensuring a secure and accurate installation every time. Simple to Use : 1. Press the switch to start pumping 2. Set the safety red line to 0.6 to reach a vacuum environment 3. After the construction is completed, turn off the switch and quickly deflate 4. pay attention to the digital display, when the value is lower than 15%, please charge. You will get ： Electric Suction Cup x1 21V Battery (1300mAh)x2 Chargerx1 Storage Box x1 Instruction Manual x1