Description: Efficient PTC Heating: Uses a PTC ceramic element and aluminum tube construction, ensuring low thermal resistance and high heat transfer efficiency for rapid and consistent heating Safety Protection: Features a surface-insulated design for safe handling. Built-in 160 degree Celsius normally closed thermal protector to prevent overheating and dry burning, high temperature resistant lead wires adding another layer of security Self-Regulating & Energy-Efficient: PTC Insulated Air Heater automatically maintains a constant temperature without the need for additional thermostat circuits, providing a stable heat source Easy to Install: Equipped with convenient pre-drilled mounting holes (8x4mm) for simple integration into your projects Versatile Use: 600W 220V Insulated PTC Ceramic Heater is ideal for DIY heaters, incubator, humidifiers, air conditioners, and various general appliances Specification: Heat material: PTC Thermistor Lead wire: high temperature line Mounting hole spacing: 10.4x6.8cm/4.1x 2.7inch Size Chart: 12.4cmx7.6cm/4.88inchx2.99inch Package Includes: 1 Piece PTC Heating Plate Note: Please allow slightly errors due to manual measurement and different monitors.