Seamlessly integrate a compatible Motorola cell phone into a SD4500 phone system base with handset with this optional cell phone dock module. Simply place the dock wherever your cell phone gets the best reception and you"ve added a second line to your home or office!With your compatible Motorola cell phone in the dock module, you can use your wireless plan minutes for long distance calls. Plus, you"ll never have to run to find your ringing cell phone, because your cell calls will ring through to all of your handsets and base. What"s more, since the cell phone dock module is also a charger, your cell phone will be ready to go when it"s time to leave the house!