All you need is a phone line! All phone lines have a constant flow of voltage, around 40-70 volts (up to 100 volts when it rings!), but you can't just plug stuff into it and expect it to work.
Children older than 5 and more than 40 pounds must ride in a booster seat until the child is 8 years old or is taller than 4 feet 9 inches. Anyone over the age of 8 must be protected by a safety belt.
The laws vary based on age, height, and/or weight. For example, several states allow children the age of six and up or over 40 pounds to use the regular seatbelt without a booster seat. But as Elliott.org points out, there are safer guidelines from SafeKids.org regarding not just weight but height: Kids should be at least 4â9â tall and weigh at least 80 pounds before transitioning out of the booster. The American Academy of Pediatrics says kids between 8 and 12 years of age should be in booster seats.