Comparison Ice Ring 54mm vs ColMi R02 8

The size of the ring should correspond to the size of the finger on which it is intended to be worn. A product that is too large will dangle and even fall off, while a product that is too small will put too much pressure on your finger (if it fits on it at all).

There are several options for marking the size of smart rings. So, in the American style, it is customary to indicate size in numbers from “7” to “11” (smaller and larger values also occur, but quite rarely). A more traditional designation is the diameter of the ring, expressed in millimeters - it is customary to mark classic and jewelry rings in a similar way. In any case, there are special tables and measuring kits to determine the appropriate size.

Types of sports and medical measurements supported by the gadget (plus some functions for similar purposes).

— Pulse monitor. The heart rate monitor in smart rings is used to determine the frequency of contractions of the heart muscle. Measuring heart rate is important for targeted sports training - based on the readings of the heart rate sensor, you can adjust the intensity of training so that the heart rate is constantly in the optimal range and, moreover, does not exceed safe values. At the same time, pulse rate is one of the most important indicators of the state of the body’s cardiovascular system.

— Pressure (tonometer). Sensor for measuring blood pressure level. It is worth considering that the measurement error using it can be 10% or even more - it will not replace a full-fledged medical tonometer. On the other hand, a gadget with this function is quite capable of detecting a critical increase or decrease in pressure, which allows you to take the necessary measures in a timely manner.

— ECG (cardiogram). The ECG sensor provides detailed information about the user's heart function. Note that it is not a full-fledged electrocardiograph, but rather an advanced type of heart rate monitor with the ability to monitor heart rhythm patterns. With its help, you can detect some dangerous phenomena and take appropriate measures in time - fo...r example, atrial fibrillation, which is initially imperceptible to a person.

— Heart rate variability (HRV). Sensor for measuring the intervals between successive contractions of the heart muscle. These measurements are important indicators of the functioning of the nervous system and can reflect stress levels, physical fitness, and the general condition of the body. At the same time, the heart rate variability (HRV) indicator helps assess the user’s readiness for physical activity, determining the optimal moments for training and rest.

— Blood oxygen level. A pulse oximeter is responsible for determining the level of oxygen saturation in the blood. Measurements using it are carried out using a non-invasive method, i.e. without punctures or other damage to the skin. Like most “medical” sensors in smart rings, the pulse oximeter is not ultra-precise and is not a full-fledged medical device, but it is quite capable of responding to a critical decrease in oxygen levels in the blood. The function can be useful both for certain diseases of the respiratory system and for completely healthy users (primarily climbers and balloonists).

- Body temperature. Sensor for measuring the user's body temperature. The built-in thermometer can produce small measurement errors, so it is not always able to recognize slight deviations from the norm, but a significant increase in temperature will definitely not miss such a sensor.

— Number of steps. Function for counting the number of steps taken. The pedometer usually uses data from the built-in accelerometer and the measurement results with its help are quite accurate. The only exception to the rule is shaking when traveling on public transport or driving a car. When evaluating the results obtained, she may add a few extra steps.

— Distance traveled. Measures the total distance traveled by the user. For this, data from a pedometer is usually used - the distance covered is calculated by the number of steps multiplied by a given step length. This method has an error, but most often this drawback is not critical.

— Energy consumption (calories). Measuring the number of calories burned. These data are quite approximate, since they are calculated using indirect parameters (speed and range of movement, personal characteristics of a person, etc.). However, even such accuracy is quite sufficient to determine the overall effectiveness of training.

- Sleep tracking. To assess quality, data from several smart ring sensors is used at once. Thus, a heart rate monitor monitors the user’s heart rate, an accelerometer tracks his movements, and a pulse oximeter (if provided) increases the accuracy of collecting information about the quality of sleep. According to sensor readings, the moments of entry into and exit from deep sleep phases are recorded. The feature helps you determine an appropriate time frame for going to bed and can provide personalized recommendations to improve your night's rest.

- Stress level. The level of stress in the body is a very relative indicator. The metric that determines heart rate variability (see above) helps to evaluate it. However, the user's breathing rate and oxygen consumption are taken into account. Stress levels are usually shown on a scale from 0 to 100, often indicating the number of hours the body is under stress and the time it takes for it to return to normal. From a practical point of view, this parameter allows you to determine the most optimal body mode for sports or all kinds of activities.

— Women's calendar. A function that allows you to track the characteristics of the menstrual cycle in the fair sex. The women's calendar records cycle dates, fertile windows and ovulation days, and the device itself can calculate the estimated start date of the next menstruation. Keeping a women's calendar will help determine the most favorable days for conception, notice alarming symptoms in time and prevent many diseases due to cycle disorders.

The presence of preset sports training modes in the smart ring. The most common ones are running, walking, cycling, swimming, etc. Note that the quantity and quality of recorded data for different sports directly depends on the technical level of equipment of a particular device.

Capacity of the battery installed in the device. Theoretically, the higher the capacity, the longer the smart ring will stay afloat without the need to recharge the battery. However, in practice, the autonomy of a gadget also depends on its energy consumption, and this is determined by the characteristics of the display (if available) and functionality. Therefore, in terms of battery capacity, you can only compare models of the same type with very similar technical parameters, and to accurately assess autonomy, it is better to focus on the directly stated operating time (see below).

Some models of rings do not have a built-in battery at all. Smart functions are not available in them, but they do have NFC and ID / IC modules (for more details, see “Identification modules”).

Time of continuous operation of the smart ring without recharging the battery. When choosing based on this indicator, it is worth considering that it is quite approximate. In practice, the operating time greatly depends on the intensity of use of the gadget. Often, the estimated autonomy period refers to the use of a device with a relatively low load.

Materials used for smart ring bodies:

– Ceramic. Ceramic is made through sintering and firing at high temperatures. It is strong, durable, and extremely resistant to scratches and damage, maintaining its appearance for a long time. However, it is susceptible to damage from strong, localized impacts.

– Steel. Steel is strong, reliable, and resistant to corrosion. It has a stylish look and is relatively affordable, cheaper than ceramic and titanium. However, it is heavier, and some users may experience allergies to the metal.

— Titanium. A premium material that is both lightweight and extremely strong. Titanium rings hold their shape well under impact, are resistant to corrosion, and are hypoallergenic. On the downside, they are sensitive to scratches and are the most expensive option.

— Metal. Cases made from various metal alloys combine high strength, durability, and resistance to external factors in one product. It should be noted that steel smart rings are not included in this category — they are listed separately (see "Steel" above).

This parameter allows you to determine the degree of resistance of the smart ring to moisture according to the WR (Water Resistant) standard. Traditionally, it is indicated as the maximum depth under water at which the gadget is able to remain sealed. However, the physical features of such measurements are such that this figure very poorly corresponds to the actual permissible immersion depth. Thus, models with water protection rating 30 WR / 3 ATM have only protection against accidental splashes, 50 WR / 5 ATM - can withstand maximum exposure to rain or running water when washing hands. Full immersion allows a level of 100 WR / 10 ATM, but only to a small depth and without any “extreme”.