Parcel Locker 100 Series 101 10.4 inch, touch screen,6 door, Control Unit Details 111 UL Certified, Cold Rolled Steel,11 door, Add-on Unit Details 114 UL Certified, Cold Rolled Steel,22 door, Add-on Unit Details 102 10.4 inch, touch screen,5 door, Control Unit Details 112 UL Certified, Cold Rolled Steel,4 door, Add-on Unit Details 121 Headless Unit, One-Time Charge per Year,11 door, Control via Bluetooth Details 103 10.4 inch, touch screen,17 door, Control Unit Details 113 UL Certified, Cold Rolled Steel,10 door, Add-on Unit Details