Does the negative ions function turn off after 1 hour? Is there a way to keep it on all night?

All Ereada® mats naturally generate negative ions whenever they are warm — either from the heating system or from your own body heat. Even when the mat is unpowered, the crystals and internal anion layers can still release ions in response to slight temperature changes.

The Negative Potential (N.P.) function available on Brown Ereada® mats and certain Gemstone Mini mats is an additional feature that works differently. It is similar in concept to Richway’s E.D.N.I. (Electrical Discharge of Negative Ions) system. When activated, the controller supplies DC energy to a special silver-fiber layer inside the mat, creating a gentle electrostatic negative field.

N.P. operates automatically:

• about 1 hour on mats larger than Mini
• about 30 minutes on Mini mats with N.P.

The Air Ion function on Purple and Gemstone mats (sizes larger than Mini) also runs for about 1 hour and then shuts off automatically.

If you want to stop or restart the N.P. or Ion function before the timer ends, simply press the ION or NP button again.

Even with all additional functions turned OFF and no active heating, the mat will continue to generate a small amount of negative ions naturally using your body warmth.