With open-valve mechanism [400% More Suction Capacity, compared with other goot model] Good for a wide range of soldering work, for terminals, connectors and flat ICs [Ceramic Heater with Internal Sensor (soldering & desoldering)] Keep the temperature constant during desoldering [Superior Temperature-Control Circuit] Reduces noise during heater ON/OFF [Zero Volt Switch Circuit] Makes changing the filter easy [Replaceable Cartridge Filter]