The Puff Bottle is pre-filled and constructed with six layers of high-density PVC. To use, plug in the charger and let the bottle heat for 8 to 12 minutes (depending on the room temperature). The red indicator light on the charger will turn off when it's ready. After removing the charger, you can enjoy 1 to 6 hours of warmth (depending on the room temperature).
WARNING: Hot water bottles can cause burns. Avoid prolonged direct contact with the skin.