The B915/B915I Basic Keypad is a SDI2 bus compatible device. Each keypad has user adjustable options, such as volume and display brightness. The keypad shows two-line system messages for all areas. LCD display The keypad uses words, numbers, and symbols to show the status of the security system. When several events occur, the keypad shows each event in order of priority. Keys Each keypad has 10 number keys and 5 navigation and function keys. When pressed, keys turn on keypad backlighting and emit the keypress tone (a short beep). Audible tones The keypad has a built-in sounder that produces several distinct audible warning tones. Each audible tone sounds different, so users can recognize an event by hearing its unique tone. The keypad backlight illuminates when the keypad emits an audible tone. To silence the tone, users enter a passcode.