From the product description, check product page for current description, price and availability:

Keep your yeast happy and your ferment warm during those cold winter months with this flexible heater wrap! Don’t be fooled by imitators and cheap knock-offs, this is the original FermWrap that has been produced by Fermentap for over a decade. Unlike those old heater belts, the FermWrap covers a wide area of your carboy or fermentation vessel, promoting an even heat distribution. Using tape to adhere, the FermWrap can be attached directly to your fermenter, or can be used to heat the space in a box (or refrigerator) that the fermenter is in. Depending on your configuration and insulation, you can increase the temperature of your ferment from 5-20°F. This differential can be increased by using the BrewBuilt™ Neoprene Carboy Sleeve.

With 40 watts of heat spread over almost two square feet, it provides gentle, even heating.

For more precise results, we recommend a temp controller and carboy thermowell. The controller will monitor the fermentation temp and only power on the FermWrap if the temperature drops below your set point. For the ultimate level of control, we recommend pairing it with the BrewBuilt CoolStix™ to provide cooling. With both accessories plugged into the temp controller, you’ll get cooling or heating whenever you need it.

Specs:

• 40 watts
• 115V
• 11″ H x 25″ W

Item does not include carboy as pictured.