Large permanent filter can hold up to 6 tablespoons of medium ground coffee for maximum strength, adjust strength by adding less ground coffee. The On-the-Go also works with pre-packaged soft coffee pods for an even quicker brew and faster clean up. As an added convenience and safety feature, the unit automatically shuts off after the brew cycle is complete. It also includes an On/Off button to save energy when not in use. Use the mug to measure out the water before filling the water tank to ensure no coffee will overflow.