This item is provided by Crutchfield.com and includes free phone technical support for the life of the product. Details on how to take advantage of this service will be included with your package. Should you have any issues locating information on how to contact Crutchfield Technical Support, please contact this website's Customer Service department. Cooling for high-power and "always on" components High-performance components need effective cooling to ensure optimal operation. For high-power amplifiers or "always on" set-top boxes, sometimes passive cooling just isn't enough. The Salamander Designs Chameleon active cooling panel features two 120mm whisper-quiet fans to provide constant airflow. You'll attach an included sensor to your hottest-running component, and the fans will kick on when the temperature reaches 80 degrees F. In addition to providing reliable air flow for cooling, the extended panel also adds 3-1/2" to the depth of the cabinet. What's in the Box: 1. Rear-panel with two active built-in fans and thermistor 2. AC power adapter 3. Assembly Instructions