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Product description: LM339 is an integrated circuit that consists of four independent voltage comparators. The device is designed to operate from a single power supply over a wide range of voltages. Features: Wide supply voltage range: 3V to 32V Low power consumption: 3.2mW Outputs are designed for push-pull operation Low input offset voltage: 2mV Hysteresis voltage: 0.8V Input common mode range includes ground Schmitt Trigger Input High Gain: 100V/mV Differential Input Voltage Range: ±15V Output voltage swings rail-to-rail Applications: Motor speed control Temperature control Over-current protection Light intensity control Contact sensing Audio electronics Battery level monitoring (For reference only)