GRABO Pro is equipped with a robust vacuum pump. The foam rubber vacuum seal on the GRABO Pro tool is strong and resistant to loss of vacuum pressure. Once the pressure pump is activated, it creates a strong suction and firmly attaches to any non-porous flat surface. The suction is strong enough to hold firm even loads as heavy as 375 lbs . In order to lift any slab of flat solid material, simply turn on the unit and place it straight on the surface. The GRABO Pro automatically monitors the vacuum and if vacuum pressure is lost the pump is automatically powered up until the vacuum pressure is restored. Package Contents: 1 GRABO Pro tool (2021 model with digital display), 1 multi-socket charger, 1 seal (preinstalled on the tool), 1 battery (preinstalled on the tool), 1 tough Oxford fabric carry bag and an operator’s manual in English.