Comparison Mystery MTH-24B vs Mystery MTC-24

— Refrigerator container. Thermally insulated containers designed for use in cars and as close as possible to ordinary kitchen refrigerators both in functionality and appearance. They look like boxes, most often plastic, can have a rather large volume (40 liters or more), are designed primarily for stationary installation in a car and are usually quite inconvenient to carry (although most models can be easily carried in hands over short distances). Equipped with temperature maintenance systems (up to compressors, see "Functions"), they require external power supply.

— Cooler bag. Like the containers described above, this type belongs to car accessories, requires external power, is able to provide cooling similar to classic refrigerators, and can also have other modes of operation (see below). Externally, in accordance with the name, such models resemble ordinary bags, often have fabric upholstery, external pockets, and almost always carry handles. They are easy to transport in your hands, which can be useful for loading: it is often more convenient to load the refrigerator in the kitchen and transfer it to the car than to carry the products separately to the car. This design of the refrigerator is also especially convenient for outdoor trips, picnics, etc. On the other hand, bags usually have a small volume (not exceeding 40 liters).

— Embedded. As the name implies, this variety is desig...ned for permanent installation in vehicles. Its main difference from the containers-refrigerators described above is its poor suitability for carrying from place to place, in addition, such devices can have quite large volumes. Due to their large size, most built-in refrigerators are not well suited for passenger cars, where there is usually little space — but they can be very useful for buses, tractors, motorhomes, and even boats and yachts. Some of these models are originally made for a specific brand of car.

— Refrigerator-armrest. A specific type of refrigerator-containers (see the relevant paragraph). The main difference of this variety from the "ordinary" containers is just the possibility of installation as an armrest. At the same time, installation methods can be different: some models are placed in the centre of the rear seat and are fixed with a seat belt, others can also be installed between the front seats. The main advantage of such units can be called the fact that they create a minimum of discomfort, and often vice versa — they provide additional convenience, playing the role of the actual armrest. In addition, coasters and other additional devices can be provided on the case. However, before buying, you should make sure that the selected model is suitable for your car in shape and dimensions. Also note that the volume of refrigerators of this type is relatively small — usually less than 25 liters.

The presence in the refrigerator of separate zones for storing products, separated by a stationary dense wall of a non-removable structure. The vast majority of car refrigerators have a single-chamber layout, however, there are also two-chamber models, which is extremely convenient for sorting products.

— Cooling. A mode of operation in which the food placed inside is cooled to a temperature just above zero (the minimum threshold is usually around 4 °C). Present in all car refrigerators by definition.

— Freeze. An operating mode designed to cool the food placed in the cooking chamber to a temperature below zero (in some models down to -18°C). In some models, it can also be used for making ice in special compartments.

— Heating. The mode of operation for heating products is especially useful in the cold season. Many models with this function have fairly good heating characteristics, allowing you to heat food in them to a hot state. This mode is also good for keeping food hot. However, car refrigerators with a heating function are usually quite expensive.

This parameter determines how many degrees the refrigerator is able to cool the product loaded into it relative to the ambient temperature. Let's say the maximum cooling for a particular refrigerator model is 20°C; at an air temperature of +30°C, a product with the same temperature is loaded into it. Thus, the final temperature of the product will be 30 – 20 = +10 °C. In addition, it should be noted that the final temperature cannot be lower than the minimum cooling temperature (see Minimum cooling temperature)

An indicator of how many degrees the refrigerator is able to heat the product placed in it relative to the ambient temperature (if there is a heating function). Suppose a product at a temperature of +15 °C is placed in a refrigerator with a maximum heating of 60 °C; thus, the temperature of the product at the end of heating will be 75 °C, which is more than enough for the perception of food as warm and its comfortable consumption.

The power consumed by the refrigerator when operating in cooling mode. The greater this power, the more performant the refrigerator is, usually, and the less time it takes to cool the product. On the other hand, note that more power means more power consumption — which can be critical, for example, during long-term operation from a car battery (that is, when the car engine is turned off).

The power consumed by the refrigerator when operating in heating mode. As with cooling, more power usually means more performance; see "'Сooling energy consumption" for details.

The supply voltage for which the car refrigerator is designed. There are several standard options:

— 12 V Standard voltage of the on-board mains of passenger cars, as well as many minibuses and light trucks. Supported by most modern car refrigerators.

— 24 V Standard voltage of the on-board mains of buses, heavy trucks and other large equipment; also found in some SUVs. Car refrigerators "only for 24 V" are almost never produced; as a rule, this option is provided in addition to 12 V.

— 230 V Powered by a standard household outlet. Usually a backup option, in case the refrigerator needs to be turned on outside the car for a while — for example, to pre-cool before a trip. In addition, units with such power can be used as an improvised replacement for a stationary refrigerator — for example, when going to the country, where there is no permanent refrigerator.