STAK-120-E Electronic Quick Access Key Cabinet The electronic pushbutton lock gives you added security and convenience. Simple 5 button keypad, Battery power, 2 AAA cells, All codes are 4 digits long The lock will signal low battery to the user via the LED flashing. The lock will open 100 more times after this signal is initiated Should the batteries fail the lock can be opened by placing the + and - terminals of a 9 volt