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.
Infants and young children must ride in a child safety seat until they are 4 years old AND weigh at least 40 pounds. Every child ages 4-8 who is no longer in a car seat must use a booster seat until she reaches 4â9â tall.