They run double AA batteries. The base unit uses 4. The mobile unit uses 2, It also has a clip on it to carry around or set it up standing. It has a port for a charger also.It did not come with a charger cord.it has been used for one weekend when my grandson stayed here.
It has to be 3 1/2 years old. He just turned four.I was going through a dresser drawer of baby clothes and stuff he has outgrown. I had forgotten I even had it.
I could hear it 2 levels of the house. I never had the opportunity to use it outside. It has a pocket clip on if. When I bought it, it was one of the best ones at the time. If I remember correctly