Safewell 17EF Safe Box: CODE: Open & close with 3-8 digit codeINDICATOR: 3 indicator lights(green, red & yellow)indicate open, low battery and warningWORKING SYSTEM: Use the knob to open and close with a solenoid systemRESET BUTTON: Change the code easily with reset buttonBOLT: One-way locking bolts(2 bolts