This is a very simple 2 watt mono amplifier module KITbuilt around the National
Semiconductor LM380 amplifier Integrated Circuit. It has a a low component count, no external heatsink is necessary, it is short circuit and overload protected and has high gain. Input 10 - 20 V at 300 mA, output 2 Watt max. (4-8 ohms, 20V).
The product datasheet is available here to view