9V Battery. Nine Volt battery

9v battery, fetal Doppler batter, alkaline battery, baysonic battery ,The nine-volt battery, or 9-volt battery



The nine-volt battery, or 9-volt battery, is a common size of battery that was introduced for the early transistor radios.
It has a rectangular prism shape with rounded edges and a polarized snap connector at the top.
This type is commonly used in BabySonic fetal doppler