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PJ2W100MNN1220 is part of the Elitech W2 Temperature Controller, which is designed to control temperatures from -50 to 140°F (-10 to 60°C). The device is an all-in-one temperature control system, which provides various functions such as temperature sensing and display, relays to switch circuits on and off, over-temperature alarm, etc. It has a NTC thermistor temperature input and 100mV (0-100) output option. It also features a single-key damp setting, which helps to limit the setting of high or low temperature. This can be used for various applications, including refrigeration and air conditioning systems.