Comparison Xiaomi MiJia Electric Shaver S700 vs Xiaomi MiJia Reciprocating Five Cutter Head

Electric shavers are divided into types depending on the design and principle of operation of the shaving heads.

— Rotary. Rotary shavers have characteristic round shaving heads inside which blades rotate. Their main advantage over foil is a better fit of the blades to the skin and, as a result, a more efficient and clean shave. And rotary models are generally less noisy. On the other hand, rotary heads can be uncomfortable for people with sensitive skin; this is especially true for inexpensive models — advanced products usually use special tricks designed to minimize irritation from shaving.

— Foil. In foil shavers, the blades do not rotate, but vibrate finely under the foil with small cells. This design is considered more gentle compared to the rotary, because foil reduces irritation and reduces the risk of cuts. However, in terms of shaving cleanliness, foil models, especially low-cost ones, can be noticeably inferior to rotary ones, and they are worse for wet shaving.

— Shaver (travel). Compact and lightweight electric shavers, free from extra attachments and trimming blades for longer stubble, are intended for a close and smooth shave. These shavers, often termed "safety razors," are favored in professional barbershops and are even nicknamed "road razors" for their ability to provide a shave without the need for foam or other pr...oducts. With their mesh head design, they can trim bristles to an almost bare minimum (around 0.1 mm). These razors are effective for facial shaving, refining beard and mustache outlines, and even edging hairstyling. They excel at handling short hair but might struggle with long and coarse growth. These razors are commonly used for defining haircuts and shaping sideburns and whiskers.

— Shaving trimmer. Shaving trimmers usually have a small head with cutting elements that allow you to precisely remove hairs or shape them into the desired shape. During operation, the hair is cut with the trimmer knives flush with the skin, and some models allow you to set the desired cutting height. Trimmers are good for creating contours of a beard and mustache, trimming eyebrows, sideburns or any other “vegetation” on the face. Some models can be equipped with attachments to change the shaving width or height.

The number of individual shaving heads (for rotary models) or foils (see "Type") in the shaver design. More heads/foils allow for more coverage and a better shave. Note that rotary shavers traditionally have at least 2 heads, but there can be one foil. The most popular are 3 head/foil models.

The speed of rotation of the electric motor of the shaver. A higher rotational speed (ceteris paribus) usually means a higher speed of movement of the blades, which has a positive effect on the closeness of the shave.

The number of cutting movements made by shaver blades per minute. Determines the number of hairs that the device can cut in a given amount of time. The higher the number of cuts, the more efficient and faster the shaving process.

— Turbo mode. The function of a short-term increase in the speed of rotation of the motor. This increases the performance of the shaver, which can be especially important when working with thick hair or in hard-to-reach areas. Note that the turbo mode, usually, is not intended for long-term operation.

— Auto-detection of bristles. The electric shaver's head contains a sensor to detect bristle density or stiffness. Through the automatic stubble feature, the shaver's motor adjusts power according to the skin area's requirements. This capability facilitates effective one-pass shaving, even with thick stubble. As the shaving head transitions from dense to moderate bristles, the motor power decreases automatically. This not only conserves battery life but also provides a gentler experience for the skin.

— Floating head/foil. The floating or movable shaving head(s) are capable of moving relative to the shaving unit and shaver body. Such a system follows the contours of the face during shaving, which ensures a tighter fit of the shaving heads to the skin, as a result — a cleaner and better shave, especially in difficult areas.

— Possibility of washing with water. Possibility of washing the shaving unit with water. This method is often much more convenient and effective than dry cleaning with a brush or...other method. Note that being washable with water does not necessarily mean wet shaving (see above).

— Cleaning indicator. A special indicator that notifies the user of the need to clean the shaver.

— Self-sharpening blades. Blades made using a special technology, thanks to which they sharpen themselves, due to friction against each other in the process. Thus, the blades remain sharp at all times, and their maintenance is limited to the replacement of worn blades.

— Child lock. Shavers featuring a safety switch are designed to activate only when held in the user's hand and intentionally turned on. This design prevents unintended activations, such as during travel when the device might shake inside luggage, avoiding unnecessary battery drain during idle moments.

— Case. Cases include all kinds of rigid structures for storing a shaver. Cases in the form of handbags made of thick fabric also fall into this category. In addition to reliable storage of the device, they also elevate the model to the highest class. In more low-cost electric shavers, a much more primitive fabric case is included in the package.

— Charging stand. A special stand on which the shaver can be installed to charge the batteries. There are no fundamental technical differences between such charging and charging from a power cord, the main difference is that the stand can also be used to store a shaver. Therefore, shavers with a charging stand are well suited for home use.

— Wireless charging. A special stand that charges the shaver without a precise connection through the plug — just put the electric shaver on it and the battery pack will automatically start recharging. This saves the user the hassle of connecting wires and reduces wear on the connectors. On the other hand, such a function has a significant impact on the cost of the battle and increases the duration of the charging process itself, since the charging platforms themselves are made low-power for safety reasons.

— Self-cleaning station. It is a special stand where the shaver is installed for automatic maintenance. This maintena...nce, as the name suggests, primarily includes cleaning — the shaving unit is cleaned of hairs and dust - as well as charging the battery. In addition, self-cleaning systems can provide lubrication and disinfection of the shaving unit, but this function is less common and requires the use of consumables (oil and disinfectant).

— Facial brush. It is convenient to clean the face from the cut bristles with a brush. The brush that comes with an electric shaver usually has a medium bristle length. Some electric shavers are equipped with a universal brush, which is designed for both cleaning the face and combing the beard and mustache.

While higher battery capacity theoretically extends a device's operation on a single charge, practical considerations are more complex. Ampere-hours are a specific unit, comparable only among batteries with the same voltage. For differing voltages, capacity must be converted to watt-hours for accurate comparison. Furthermore, actual tool battery life depends on consumption and performance, not just battery properties. Comparing battery capacity is meaningful only when models share the same voltage and capabilities. Operating time is a more informative parameter for comparison.

The average runtime of electric shavers on a full battery charge, without recharging, is generally overestimated due to factors like hair length, density, and trimmer usage. Manufacturer claims for runtime tend to be higher than actual usage. Longer runtimes require heavier and more expensive powerful batteries. Most shavers offer around 45 minutes of runtime, while some models provide up to 1 hour or as low as 30 minutes of operation.

The presence in the design of the electric shaver charge level indicator.

It's important to highlight that in this context, an indicator refers specifically to a visual representation of the charge level. This could manifest as a battery icon or a percentage displayed on the display. Such an indicator significantly simplifies battery monitoring, minimizing the possibility of being unexpectedly left with a depleted battery.