This is the same as No. I10500 Optima II except that it has the port which you can connect to either the No. I10502SHORT  Hypoxic Optima II LED Indicator or No. L12431 Hypeye D Pro Expansion Kit. Hail the return of the visual warning light for audible altimeters! L&B has made the ability to increase your altitude awareness by adding a visual LED port to warn you at the altitudes you set.
Shipping Weight: 8 oz. (225g).

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