1.On/Off indicator 2.3 level temperature adjustment. 3. within 20 seconds, it goes to warm 1. On/Off indicator2. 3 level temperature adjustment. 3. Far infrared Mica heating, smoothly temperature increasing and High efficiency4. Overheat protection5. Far infrared radiation can activate blood circulation, relieve joint pain, relax nervous tension, more than a heater only.6. Smart and portable ...