programmable fan controller, 3 speed, auto and manual mode, override mode,24vdc power ... supply: 230VAC (12VDC optional)Inputs: 1 x NTC built-in temperature sensorOutput: 1 x 3-speed fan, max 200wattsAmbient ... temperature: 0 °C [+32 °F] ~ +45 °C [+113 °F]Operating RH: ... )Battery life: > 5years (10 years Maximum) programmable 3-speed fan controller