Part# CRD9000-4001ER: 4-Slot Ethernet Charging Cradle (Four Slot Ethernet Charging/Communication Cradle for the MC9190-G. Requires Part# 50-14000-241R: Power Supply, Part# 50-16002-029R: DC Cable & Part# 23844-00-00R: AC Line Cord - please see options. For Spare Battery - Also order Part# SAC9000-4000R. ).