'Oshizukani Light' Released to Support Quiet Environments by Indicating Voice Volume with Light

King Jim Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; President: Miyoko Kimura) will release the 'Oshizukani Light' (https://www.kingjim.co.jp/sp/oshizukani/), which indicates voice volume with light, starting Friday, June 5, 2026.

Since voice volume is invisible, it can be difficult to judge the appropriate level for the surrounding situation, leading to 'accidental loud voices' where one's voice carries more than intended, even when trying to speak quietly. In places requiring concentration, such as libraries, study rooms, and co-working spaces, or in environments where quiet is expected, like medical facility waiting rooms and offices, it is often unclear at what volume one should be mindful, leading to awkwardness for both the person being loud and the person who has to caution them.

The 'Oshizukani Light' is a light that visually prompts people to 'be quiet' by detecting surrounding voices and illuminating with a soft light when the volume exceeds a certain level. It takes the place of a person in issuing a warning, clearly communicates a standard for voice volume, and helps create a comfortable environment in various spaces.

With the introduction of the 'Oshizukani Light,' King Jim aims to propose the new value of creating a comfortable, quiet environment and to cultivate the market.

Product Overview Product Name/Part Number: 'Oshizukani Light' SIZ10 Price: ¥4,540 + tax Release Date: Friday, June 5, 2026

Product Features

・Visualize voice volume with light The microphone on the front of the unit detects the volume of surrounding voices, and the light flashes when it exceeds a specified level. It signals the invisible voice volume with a light sign. The sound detection uses 'A-weighting (dBA),' which reflects the characteristics of sounds easily perceived by the human ear, conveying a measure of voice volume that is close to the actual human auditory experience.

・3-level detection volume setting The sensitivity for noise detection can be switched on the back of the unit, with three levels to choose from: 'Low (60 dBA)' for quiet environments, 'Medium (70 dBA)' for normal environments, and 'High (80 dBA)' for noisy environments. It can be adjusted to suit the installation location, from quiet environments like libraries to places where sound is more likely to be generated. *Reference detection volume is measured at approximately 30cm from the front of the unit's microphone. *Since the detectable volume changes depending on the distance between the sound source and the microphone, as well as surrounding obstacles, please select the detection volume while testing it in the actual installation location.

・Can also be used for speech support In addition to its warning function that signals when the voice volume becomes too loud, it can also be used for speech training and support, for example, by having the user speak loudly until the light turns on. By visually indicating a standard for appropriate voice volume, it makes it easier to share a criterion that is difficult to convey with words alone.

・Interchangeable display sheets for various uses Three types of display sheets are included: 'Please be quiet,' 'Speak loudly,' and 'Blank.' They can be swapped according to the location and purpose, and the blank sheet can be freely written on with labels or by hand.

・Three installation methods: stand-alone, magnet, and wall-mount The unit can be placed on a surface, attached with a magnet, or mounted on a wall. It can be installed according to the application, such as on a reception counter or a wall.

・Supports both battery and USB power It uses a 2-way power system with either four AA alkaline batteries (sold separately) or USB power, allowing you to choose according to the installation environment and operational method.

Product Specifications Product Name/Part Number: Oshizukani Light SIZ10 Body Color: White Price: ¥4,540 + tax External Dimensions: Approx. W95 x D34 x H90 mm Weight: Approx. 113g (excluding batteries) Material: ABS (body), PC (transparent cover) Detection Volume: Low (approx. 60 dBA), Medium (approx. 70 dBA), High (approx. 80 dBA) Power Source: 4 x AA alkaline batteries (sold separately), USB power (AC adapter sold separately) Operating Environment: Temperature: 5-35°C, Humidity: 30-80% (non-condensing) Storage Environment: Temperature: -10-50°C, Humidity: 5-80% (non-condensing) Battery Life: Approx. 100 days (assuming 12 hours of use per day with 100 detections) *Battery life may vary depending on the usage environment. Set Contents: SIZ10 main unit, power cable (approx. 2m, USB Type-A to DC), 3 types of display sheets (1 of each), instruction manual (with warranty)