Foam machines and artificial snow machines and bubble blowers and karaoke machines that are rented from Partymachines.com are tested and in working order before they are shipped out. When purchasing a new foam machine or evaporative snow machine from Partymachines.com the customer does have the opportunity to return the equipment within three business days of receiving it if the product is found to be defective. Customer must fill out and fax appropriate paperwork back before return. Customer is responsible for shipping charges.