Detects Door and Window Openings with Up to 96dB Alarm Sound & Smartphone Notifications! Hub-Free Smart Open/Close Sensor to be Newly Released on July 7

Smart Open/Close Sensor Alarm KJ-218 Usage Image (1)

Kashimura Co., Ltd. (Head Office: Adachi-ku, Tokyo; hereinafter "Kashimura") will release the "Smart Open/Close Sensor Alarm (KJ-218)" on July 7, 2026, at electronics retailers and EC sites nationwide. This device detects the opening and closing of doors and windows, alerting users with an alarm sound from the unit and notifications to their smartphones. No complicated hub or repeater setup is required; anyone can easily set up and use it with just a Wi-Fi environment and a smartphone. It adds a wide range of security to daily life, from crime prevention measures while away from home to safety management such as confirming children's return or preventing access to dangerous areas.

In recent years, with the increase in dual-income households, needs for living safety and monitoring have become more diverse. This product is ideal not only for crime prevention at entrances, back doors, and large windows but also for preventing forgotten closures of small windows in toilets and kitchens, and for safety management of garages, children's rooms, and safes, easily resolving daily minor concerns. Installing a full-fledged security system can be time-consuming and costly, but this product can be easily installed as an add-on. It can be used flexibly according to your lifestyle, supporting a comfortable and secure life for the whole family.

For product details, please visit: https://www.kashimura.com/goods/home/kj218.html

Amazon: https://www.amazon.co.jp/stores/page/B6F7613D-EFC8-4275-8ACA-C5061D962264?channel=press

Rakuten: https://www.rakuten.co.jp/netkashi/

Key Product Features

Smart Open/Close Sensor Alarm KJ-218 Smart Open/Close Sensor Alarm KJ-218 Usage Image (2)

◆Alarm Sound & Smartphone Notification

When a door or window is opened or closed, it alerts you with an alarm sound from the unit and a notification to your smartphone.

◆No Hub or Repeater Required

No need to purchase additional equipment or perform complex setup. You can start using it with just Wi-Fi and a smartphone.

◆Customizable Alarm Sound to Fit Your Needs

The alarm duration can be set from 5 to 180 seconds, and the volume can be finely adjusted from 0 to 100%. It supports a wide range of applications, from warnings at maximum volume (96dB) to monitoring with only smartphone notifications and no sound.

◆Link with Other Smart Products

Through the dedicated app, it can be linked with other Kashimura smart products. For example, you can set up a linkage such as "When the open/close sensor is triggered, the smart camera starts recording."

Words from the Development and PR Representatives

The feature of this product is that when a door or window opens, an alarm sounds from the unit, and at the same time, a notification is sent to your smartphone.

We developed this with the idea that this "on-site deterrence" and "real-time awareness" would be a strong ally in supporting home security.

Furthermore, this product can be set up with just three things: "batteries, smartphone, and Wi-Fi," so even those who get "goosebumps just hearing about smart home products..." can start without hesitation.

As awareness of crime prevention measures increases, we recommend this product for those who want to start crime prevention measures easily. (Development Representative)

Recently, when I suggested installing a camera to a friend to monitor their elderly parents, they said, "I feel a bit embarrassed as if I'm being watched all the time."

While smart cameras that allow video confirmation are very reassuring and convenient, depending on the feelings of family members, this product might be a more comfortable option to introduce.

For example, even just attaching it to the refrigerator door at your parents' home can provide a subtle notification of their daily activity, so please use it as an item that allows for comfortable monitoring at a suitable distance for everyone. (PR Representative)

Product Specifications

Product Number/Name

KJ-218 Smart Open/Close Sensor Alarm

Wireless Method

Wireless LAN (Wi-Fi)

Communication Frequency Band

2.4GHz (5GHz not supported)

Power Supply

2 AAA alkaline dry batteries (sold separately)

Detection Distance

Approximately 10mm or more

Notification Count

Approximately 2,000 times *1

Volume

Minimum approx. 62dB / Maximum approx. 96dB *2

Alarm Duration

5 to 180 seconds

Product Dimensions/Weight

W40 x H91 x D21mm / 44g

Accessories

2 adhesive sheets

Suggested Retail Price

Open

Estimated Selling Price

¥2,380 (tax included)

*1: Theoretical cumulative count when using 2 AAA alkaline dry batteries with volume set to 100% and alarm duration set to 10 seconds. Actual notification count may vary depending on the surrounding environment.

*2: Measured at a distance of 1m from the unit.