Panasonic ER-SB40-K Review: How Efficient and Worth Buying is the Panasonic SB40 Popular Beard Trimmer?

The new generation beard and hair trimmer Panasonic ER-SB40-K won the “GQ grooming award 2017”. It comes with a digital interface for user-friendly grooming facilities for stubble beards. This popular trimming machine has been made for cordless and corded use, which makes it more compelling to versatile users. In this article, I’ll share all the facilities and technologies of the Pansonic ER-SB40 trimmer, including the device’s cons. So, read this full article before you buy this trimmer.


  • The Panasonic ER-SB40 has been engineered with precision dial technology to adjust beard and hair trimming lengths.
  • Panasonic used hypoallergenic wide-tip blades for ultra-sharp trimming performance without compromising coarse and long hairs.
  • An adjustable comb attached to the trimmer provides 19 cutting lengths along with the dial wheel.
  • It comes with a high-power Japanese motor that provides super-fast performance and makes 9,800 cuts per minute.
  • It’s a cordless + corded device that can also be used while charging and removing the cord.
  • The full rare side had been engineered with sure-grip soft rubber to make comfortable grasp and secure handling.
  • The rechargeable Li-ion battery provides 60 minutes of cordless runtime with a 1-hour full charge.
  • A digital LED display on the trimmer shows battery life, charging, and lock indication.

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What’s in the Box?

I got the following items in the Panasonic ER-SB40’s package:-

  • The trimmer itself.
  • Charging adapter (universal).
  • Cleaning brush.
  • Blade oil.
  • Attachment comb.
  • A zipper storage bag.
  • User manual.

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Features and Specifications Analysis

Hypoallergenic Blades

Panasonic ER-SB40 hypoallergenic wide-tip blades

Panasonic used their best Japanese Hypoallergenic blades in the Panasonic ER-SB40 beard trimmer. On the other hand, Panasonic engineered the blades with wide teeth for catching more hairs than usual trimmer blades. I observed the trimming result becomes charming without any spare. While discussing with the professional users, they said; the blades are very durable and provide unchanged sharpness for a long time. I have to admit that these Panasonic blades are the main compelling feature of this trimmer for being too popular.

Precision Dial Technology

Panasonic ER-SB40-k trimmer precision dial system

The Panasonic ER-SB40 trimmer has been engineered with precision dial technology. As a result, it’s very easy and quick to change the trimming length for different trimming sizes. There is an attachment comb with the trimmer upwards and downwards while rotating the dial wheel to increase and decrease the trimming lengths. The precision dial along with the attachment comb, provides 19 beard trimming lengths from 1mm to 10mm in 0.5mm incremental steps. Moreover, the trimmer itself provides a 0.5mm trimming length trimming result without any setting and the attachment for precision trimming and detailing.

Powerful Motor

Another compelling feature of the Panasonic ER-SB40-K trimmer is the serving motor. Panasonic used a Japanese linear motor in this trimmer for high-end performance and to make the trimming result more efficient. With its high torque, the powerful motor can make 9,800 trimming cuts per minute. Consequently, the trimmer doesn’t compromise with any coarse hair or long hair and makes the trim without dropping the torque until the battery power ends.

Cordless + Corded Trimmer

The Panasonic ER-SB40-K is a professional and personal trimmer that allows grooming with and without the cord. It’s very useful for men who use the trimmer for professional trimming and makes prolonged uses. On the other hand, the trimmer can be used worldwide since it comes with a universal charging adapter (110v – 240v). If your rechargeable battery drains fully and you need an urgent trim, the corded feature will help you the most.

The Rechargeable Battery:

The trimmer comes with a rechargeable Lithium-ion battery. The battery provides 60 minutes of continuous cordless runtime with a 1-hour full charge. Personal users usually like to use cordless grooming devices and the Panasonic ER-SB40 is good stuff for them.

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Waterproof Device

Waterproof Panasonic ER-SB40 trimmer

Panasonic made this shaver fully washable with direct running water which makes the cleaning process easier and faster. After making a trim, you just need to put the shaver head under the tap for a thorough cleaning. There is a washable signed logo at the lower front side of the shaver that ensures a secure wet cleaning facility. The manufacturer provides a small cleaning brush with this trimmer that is also used to clean the debris from the blades quickly but the cleaning with the brush is not much thorough. Therefore, the wet cleaning option is really very useful for a trimmer I think.

Wet/dry Trim

Since the trimmer is 100% waterproof, it’s allowed to trim wet beards/hairs without any risk. Therefore, you can trim your wet beard even under the shower and the trimmer will not face any kind of water-causing issue. But it’s not recommended to use it with water while operating with the cord since it may occur accidental electrical shock.

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Built Quality

While talking about the built quality, the revolutionary craftsmanship of the Panasonic ER-SB40 comes first. The body of the Panasonic ER-SB40 has been designed with fully black plastic with dotted sure-grip at the rare side. It comes in a slightly curvy body for user-friendly operations and secured holding. I really admit that the ergonomics of the Panasonic ER-SB40-K is really compelling. On the other hand, the manufacturer used their highest-end hypoallergenic blades in the trimmer for flawless trimming. The blades are very sharp and hard that stay sharp consistently for a very long time until they damage. As a result, the trimming efficiency becomes more reliable. The trimmer comes with an attachment comb that works together with the precision dial technology to provide different trimming lengths. The trimming length adjustment is pretty easy and quick but there are only 20 trimming lengths the trimmer can adjust and the maximum length is 10mm that I found pretty less. Moreover, the adjustment comb feels cheap that should be sturdier I think. However, I didn’t find anyone who blamed the comb for breaking down or misbehaving. Panasonic placed the power button after the dial wheel which is easily findable. Below the power button, there is an interesting LED display that shows the battery level, setting lock, and charging indication. The display shows the battery level in 3 segments (high, mid, and low). At the bottom of the shaver, there is the power port that is used to recharge and corded use.  To sum up, I do admit that the Panasonic ER-SB40 has a sturdy and user-friendly built quality that is really appreciable.

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  • Very fast performance.
  • User-friendly functions.
  • Good built-quality.
  • Cordless + corded operation.
  • Universal voltage.
  • Easy to clean.
  • Digital LED display.


  • Expensive.
  • Precision trimming is a bit difficult with this wide head.
  • Should have more trimming lengths.
  • The comb doesn’t feel sturdy.


The Pansonic ER-SB40 is a pretty powerful and sturdy device that is enough for personal grooming. It’s a long-time investment that may be a blessing for some user who likes to maintain their short and long stubble but not well for men who like long beards. So, it’s only recommended for the person who doesn’t trim his beard longer than 10mm.

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