Planet has upgraded two models named ISW-621T and ISW-621TS15 for use in environments with wide operating temperature ranges. The large 'T' in the model names indicates that they support and can operate in temperature ranges from -40 to 75 degrees Celsius. Since temperatures in many regions of the world can drop below -10 degrees Celsius, these two new models, ISW-621T and ISW-621TS15, are ideal for use in transportation, manufacturing, security, and surveillance networks in harsh environments. The ISW-621T and ISW-621TS15 also offer a high level of immunity to electromagnetic interference and strong electrical surges, which are common in production facilities or traffic control cabinets at the roadside.