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.
A â A booster seat is a firm cushion, with or without a backrest, that positions the lap and shoulder belt on the child. Depending on the model, boosters fit children from 30-40 lbs. up to 80-125 lbs. require a minimum age of 3 or 4. minimum age or weight specified on the label or if a booster is used with just a lap belt. child in a seat with a harness as long as it fits.