This is a general-purpose 4 Ohm 2 Watt Speaker that can be used for a variety of audio projects. It has a balanced frequency response and is extremely efficient. It is a type of transducer that converts electromagnetic energy into sound waves. It converts analog signal inputs from computers or audio players into sound waves. Because of its small size, it can be used in a variety of power applications where space is limited. This internal magnet speaker is designed with a metal shell, an internal magnetic type. This is easy to install- oval top speakers with paper cones and neodymium magnet. It can be used in Doorbells, Bluetooth speakers, music systems, Alarms and various other projects.