King Jim Launches 'Oshizukani Light', a Light that Notifies Voice Volume to Support Creating Quiet Environments
King Jim Co., Ltd. will release the 'Oshizukani Light' on June 5, 2026. The device visually alerts people with light when their voice exceeds a set volume, supporting quiet environments in libraries and offices.
📋 Article Processing Timeline
- 📰 Published: April 14, 2026 at 20:00
- 🔍 Collected: April 14, 2026 at 11:31
- 🤖 AI Analyzed: April 19, 2026 at 18:01 (126h 29m after Collected)
King Jim Co., Ltd. (Headquarters: Chiyoda-ku, Tokyo; President: Miyoko Kimura) will release the 'Oshizukani Light' (https://www.kingjim.co.jp/sp/oshizukani/), which notifies voice volume with light, on Friday, June 5, 2026.
Because voice volume is invisible, it is difficult to appropriately judge the correct volume for the surrounding environment, sometimes resulting in an 'accidental loud voice' that echoes in the surroundings even when the person intends to speak softly. In places that require concentration such as libraries, study rooms, and coworking spaces, or places where a quiet environment is required such as medical waiting rooms and offices, it is difficult to know at what volume level one should issue a warning, and both the person warning and the person being warned often feel awkward.
The 'Oshizukani Light' is a light that detects voices around the main unit and uses a soft light to visually prompt people to 'be quiet' when the volume exceeds a certain level. By substituting human warnings and clearly communicating the standard for voice volume, it supports the creation of comfortable environments in various spaces.
By introducing the 'Oshizukani Light', King Jim proposes a new value of realizing a comfortable, quiet environment and aims to pioneer this market.
■ Product Overview
Product name/Product number: 'Oshizukani Light' SIZ10
Price: 4,540 yen + tax
Release date: Friday, June 5, 2026
■ Product Features
- Visualizes voice volume with light
The microphone on the front of the main unit detects the surrounding voice volume, and the light flashes when it exceeds the specified volume. It notifies the invisible voice volume with a sign of light. For sound detection, it adopts 'A-weighting (dBA)', which reflects the characteristics of sound that easily reach human ears. It conveys the standard of voice volume in a form close to the actual human ear experience.
- 3-level detection volume setting
The sensitivity of noise detection can be switched with the switch on the back, and you can choose from 3 levels: 'Small (60dBA)' for quiet environments, 'Medium (70dBA)' for normal environments, and 'Large (80dBA)' for noisy environments. It can be adjusted according to the installation location, from quiet environments such as libraries to places where sound is relatively easily produced.
* The reference detection volume is measured at approximately 30 cm in front of the main unit's microphone.
* The detectable volume changes depending on the distance between the sound source and the microphone, and surrounding obstacles, so please choose the detection volume while testing it after actual installation.
- Can also be used for vocal support purposes
In addition to alerting users with a light when the volume gets too loud, it can also be used for vocal training and support by having users speak loudly until the light turns on. By visually indicating appropriate volume levels, it makes it easier to share standards that are difficult to convey with words alone.
- Display sheets to choose according to purpose
Comes with 3 types of display sheets: 'Please be quiet', 'Speak loudly', and 'Blank'. They can be replaced according to the installation location and purpose, and you can freely write on the blank sheet with a label or by hand.
- 3 installation methods: desktop, magnet, and wall-mounted
Installation methods include 3 types: desktop placement, magnetic attachment, and wall mounting. It can be installed according to the purpose, such as on a reception counter or a wall.
- Compatible with battery and USB power
It adopts a 2-way power system of 4 AA alkaline batteries (sold separately) or USB power, allowing you to choose according to the installation environment and usage method.
■ Product Specifications
Product name/Product number: Oshizukani Light SIZ10
Body color: White
Body price: 4,540 yen + tax
External dimensions: Approx. W95 x D34 x H90 mm
Weight: Approx. 113g (excluding batteries)
Material: ABS (body), PC (transparent cover)
Detection volume: Small (approx. 60dBA), Medium (approx. 70dBA), Large (approx. 80dBA)
Power supply: 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, 100 detections)
* Battery life varies 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 each)
Because voice volume is invisible, it is difficult to appropriately judge the correct volume for the surrounding environment, sometimes resulting in an 'accidental loud voice' that echoes in the surroundings even when the person intends to speak softly. In places that require concentration such as libraries, study rooms, and coworking spaces, or places where a quiet environment is required such as medical waiting rooms and offices, it is difficult to know at what volume level one should issue a warning, and both the person warning and the person being warned often feel awkward.
The 'Oshizukani Light' is a light that detects voices around the main unit and uses a soft light to visually prompt people to 'be quiet' when the volume exceeds a certain level. By substituting human warnings and clearly communicating the standard for voice volume, it supports the creation of comfortable environments in various spaces.
By introducing the 'Oshizukani Light', King Jim proposes a new value of realizing a comfortable, quiet environment and aims to pioneer this market.
■ Product Overview
Product name/Product number: 'Oshizukani Light' SIZ10
Price: 4,540 yen + tax
Release date: Friday, June 5, 2026
■ Product Features
- Visualizes voice volume with light
The microphone on the front of the main unit detects the surrounding voice volume, and the light flashes when it exceeds the specified volume. It notifies the invisible voice volume with a sign of light. For sound detection, it adopts 'A-weighting (dBA)', which reflects the characteristics of sound that easily reach human ears. It conveys the standard of voice volume in a form close to the actual human ear experience.
- 3-level detection volume setting
The sensitivity of noise detection can be switched with the switch on the back, and you can choose from 3 levels: 'Small (60dBA)' for quiet environments, 'Medium (70dBA)' for normal environments, and 'Large (80dBA)' for noisy environments. It can be adjusted according to the installation location, from quiet environments such as libraries to places where sound is relatively easily produced.
* The reference detection volume is measured at approximately 30 cm in front of the main unit's microphone.
* The detectable volume changes depending on the distance between the sound source and the microphone, and surrounding obstacles, so please choose the detection volume while testing it after actual installation.
- Can also be used for vocal support purposes
In addition to alerting users with a light when the volume gets too loud, it can also be used for vocal training and support by having users speak loudly until the light turns on. By visually indicating appropriate volume levels, it makes it easier to share standards that are difficult to convey with words alone.
- Display sheets to choose according to purpose
Comes with 3 types of display sheets: 'Please be quiet', 'Speak loudly', and 'Blank'. They can be replaced according to the installation location and purpose, and you can freely write on the blank sheet with a label or by hand.
- 3 installation methods: desktop, magnet, and wall-mounted
Installation methods include 3 types: desktop placement, magnetic attachment, and wall mounting. It can be installed according to the purpose, such as on a reception counter or a wall.
- Compatible with battery and USB power
It adopts a 2-way power system of 4 AA alkaline batteries (sold separately) or USB power, allowing you to choose according to the installation environment and usage method.
■ Product Specifications
Product name/Product number: Oshizukani Light SIZ10
Body color: White
Body price: 4,540 yen + tax
External dimensions: Approx. W95 x D34 x H90 mm
Weight: Approx. 113g (excluding batteries)
Material: ABS (body), PC (transparent cover)
Detection volume: Small (approx. 60dBA), Medium (approx. 70dBA), Large (approx. 80dBA)
Power supply: 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, 100 detections)
* Battery life varies 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 each)