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.
Some go into the booster seat before they r 2 yrs old. Now the law is enforcing that kids be in booster seat til they turn 8 yrs old. Mine has long legs so I had to switch them around 15 or 16 months old.They weighed over 30 lbs too. Going by what your child can do is alot safer than going by age. If your child can sit without support, and hold his own head up, and is at least 24 pounds ( a little less is okay.) Then is is probably okay to put him in a booster seat.