听力原文：Welcome to the Intelliverse exhibit here at the National Safety and Security Expo. My name is Sheryl London, and I would like to show you what products Intelliverse is creating to make your home safe and secure. First, we have a tiny gadget called the Safesensor, which will automatically lock the front door of your home. If you go to bed and leave the door accidentally unlocked, Safesensor is programmed to automatically lock the door at a certain time of your choosing each evening. Another new product Intelliverse is quite proud of is the Quicklock. Designed for bicycles, the Quicklock allows users to keep their bicycles safe while at work or in school. The third product is the Keyvault. The Keyvault is a small device which stores house and car keys on the back of a person's mobile phone. The key chain will be soon obsolete thanks to the Keyvault. What is the main purpose of the talk?