The Laerdal Suction Unit (LSU) is a portable, powerful and highly reliable suction unit designed for optimal preparation in emergency situations. LSU Serres has a reusable canister and disposable liner to avoid contact with contaminates. For the assurance you need, the LSU device test will tell you in 10 seconds whether the LSU is ready for use in the field. The test includes four important requirements for the LSU to pass. - Blockage in the Suction System - Vacuum build-up efficiency - Maximum achievable vacuum level - Air leakages in the Pump System As the Laerdal Suction Unit automatically charges when connected to an external power source, and charges to 80% after just 3 hours, it is ready for use when needed.