DSP KD2033 Electric Vacuum Sealer along with its packaging. A vacuum sealer is a device that removes air from a bag and seals it to preserve the contents, often food. This particular model is designed for home use and has a suction value of -60KPa. Vacuum sealers are useful for preventing freezer burn and bacterial growth, extending the shelf life of food. There are two main types of vacuum sealers: chamber and external. This model appears to be an external or suction vacuum sealer, which works by drawing air out of the bag. The packaging indicates that it operates at 110W and can seal bags up to 30cm wide.