Up to Three optional buttons can be placed on either side of the keypad and preprogramed for other commonly used numbers - the courtesy desk, deli, bakery, office, mangers cell phone, maintenance, the home office - any telephone number or extension that is used a lot. And the SC602 is only a few more dollars than the 2554 telephone that you are using now. All that and it is available in the standard colors, black, ash, white and red, and many other colors that can be special ordered. Available standard with amplified ADA compliant modular handset or optionally with armor cord, hardwired spade to spade cord and noise canceling microphone for noisy areas.