Hi-Lo Audio Alarm, which sounds a beeping alert if wine temperature goes above 67 or below 45 degrees. (This is in addition to the blinking display included at no charge.)
Freezer Option, which is an additional sensor and circuit to help prevent accidental freezing of wine stored in a stand-alone freezer in the event of a malfunction (not needed for fridge).
A/C Option, which is useful on air conditioner installations in humid climates to prevent ice formation on the A/C coils. It provides a variable intermittent duty cycle for the A/C operation.
