Autodialers are either physical devices or else computer applications that make automated phone calls. Generally used in the call center and telemarketing industries, autodialers can make large volumes of calls to potential customers in a short period of time. Autodialers can be set up to send a prerecorded message to the party on the receiving end of a phone call, and often have a feature to automatically transfer the customer to a live operator should the customer signal willingness to purchase, for example by pressing buttons on the phone in response to instructions. More recent web-based autodialers operate without any physical device, and generate calls via software from pre-entered call lists.