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.
Booster seats lift a child up to help adult seat belts fit children properly. Children must start riding in a booster upon outgrowing a forward-facing harness restraint (typically after turning age 4 and 40â60 pounds). It is safest for children to remain in a booster until they are 4 feet 9 inches tall, or at least age 8. Learn more about Minnesota's child passenger safety law, which requires a child who is both under age 8 and shorter than 4 feet 9 inches to be fastened in a child safety seat or booster.