Created to operate on the same terminal application foundation as the popular Optimum T4200 family, the M4200 series expands the 4200 range, adding mobility to the Optimum terminal family line. The M4230 incorporates a removable, extra long-life battery for extended use between charges. The M4230 can be re-charged by connecting the charger directly into the terminal or through an optional charging dock that also provides dial backup.