Twist the battery off, and slide the cover off the keypad that's below the display. I'd toss the cover into a drawer and get one of the stainless covers that lets you push the buttons through it. Get a programming key from one of the many eBay vendors.
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John "Smokey Behr" Gleichweit FF1/EMT, CCNA, MCSE
IPN-CAL023 N6FOG UP Fresno Sub MP183.5 ECV1852
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