Penguin Pocket WarmerPVCDiameter 9 cmManual :1. Squeeze the tablet to turn on the heat.2. Enjoy 30 minutes of heat.3. To reuse the heater, put it in a water bath for 10 minutes.Safety Tips: This is not a toy, keep it out of the reach of children! / Never use the hand warmer directly after boiling it! / Do not put in the microwave!