LM386N Characteristics:

The LM386 is a power amplifier IC designed for low loss power supplies.
To minimize peripheral components, the voltage gain is built into 20.
However, by adding an external resistor and capacitor between pins 1 and 8,
you can adjust the voltage gain to any value up to 200. The input is referenced
to ground and the output is automatically biased to half the supply voltage.

At 6V supply voltage, its static power consumption is only 24mW,
making the LM386 ideal for battery-powered applications.

LM386 is widely used in recorders and radios.