The SINBO Quartz Heater is a tungsten filament enclosed in quartz glass tubes. The infrared principle of heat transfer allows you to use this device in open spaces, for example, if you want to sit in a summer residence in cool weather. A quartz heater is an excellent choice for those who need a compact and effective means for heating any premises.1: The heater has: 2-stage heating, roll-over protection, specially treated quartz tubes, long-term and even heating, elegant design.