ISP Technologies STEALTH PRO POWER AMPLIFIER with heatsink, delivering powerful sound quality. - Model Name: STEALTH POWER AMPLIFIER - Brand: ISP Technologies - Accessories: Power adapter - Color: Black - Features: Heatsink design Thank you for viewing. This is a very powerful and loud power amplifier. ▽Output Mono (bridged) 8Ω 175W / 16Ω 106W Stereo 4Ω 90W / 8Ω 60W It was very useful for downsizing equipment by combining it with a preamp or amp simulator. It shows some signs of use, but there are no operational issues. Accessories include the power adapter, rack mount adapter, and original box. Thank you.