Lateral MOS Class AB High Fidelity Audio Amplifier, 200W RMS at 4Ohm impedance and 100W RMS at 8Ohm impedance, with power supply in range of +/-40V to +/-60V DC. Heatsink is included, and the amplifier is installed onto the heatsink. the size of the heatsink is 170x96x45mm with horizontal fins, black anodised. For more details, please read the product manual.