Call Filter: The Call Filter is a privacy device for your telephone line. It allows only callers with a user passcode to get through. Imagine, never being bothered again by telemarketers, stockbrokers, ex-spouses, or wrong numbers. No longer being harassed in the middle of the night or crank calls! The Call Filter will emit a tone - altering the caller to enter the code, (via a touch tone phone) you have given to them. If they don't have the passcode, your telephone will not ring. If needed, you can change your security code at any time by simply moving any or all of the dip switches located on the back of the unit. The Call Filter provides you with complete control over your telephone. Simply plug into your telephone jack. The lithium battery located inside the cabinet will last for approximately 5 years. Dimensions: approximately 6 1/2 inches x 4 1/4 inches x 2 1/2 inches

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