I was a little sceptical about the quality of the walkies. But I just needed something to communicate from different areas of my home. They are good for what I purchased them for. They take 4 AAA batteries. They have a small light that can be used in the dark. The walkies were smaller than expected but a great size for small hands. They transmit a clear sound. After playing around with my so for a while I was able to hear the difference in the volume. It works perfectly on every level. The only factor we have not explored is distance. We can talk from anywhere in our house.