Welcome We are OPENCAST

"Open the door Close business"

Design - Development - Production - Service

We are specilized in the ICT industry. Such as Telecom, Multimedia, TV & Radio Broadcasting, Healthcare and IoT fields. Headquarters are in Seongnam city, Gyeonggi-do, Republic of Korea.



WatchBuilder Platform

SmartWatch Monitoring System




Smart Watch MODEL#L08S

G1-style Smartwatch for elderly




Jeongseon Arirang

Intangible cultural heritage of humanity

Free listen

ATBN 아리랑교통방송

ATBN Radio

highway cctv and music

Arirang Traffic Broadcasting Network

Free listen


We, opencast have an intensive background and experienced in the ICT industry since startup. Such as Telecom, Multimedia, TV & Radio Broadcasting, Healthcare and IoT fields. Headquarters are in Seongnam city, Gyeonggi-do, Republic of Korea.


David Y.W YOON

CEO & Founder

Performing pro-basic



Dae Sung Jang

CMO Director

Radio DJ, Jang's HIGHWAY



Jeong Sun Lee

CCO Communication

TV & Radio announcer



Do Eun GOO

CMO Sales & Marketing

Korea Total Beauty Research


Brief History

• 2008 Joined Youtube channel
• 2010 Arirang Archive
• 2016 Open ArirangTBN Radio
• 2021 36th Seoul international Tour Fair Live Broadcasting
• 2022 WatIchBuilder® Service

Business hour

UTC South Korea - Seoul

Monday - Friday (9.00 AM - 5.00 PM)
Call us (031)752 4367
International +82.(0)10.2656.4367


RM#B04, 8-4, Balibongnam-ro 25beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea 13601

WatchBuilder® System"

Smartwatch Tracking and Monitoring System

The WatchBuilder is a comprehensive device and wearer management system that allows communication to many devices via our gateways. We also provide integration to third party systems and call centers to facilitate services in our focus pillars (elderly, disability and personal safety)

1. WatchBuilder® is a virtual assistance that offers connected objects, personalized services, listening and above all a stronger bond with your family and loved ones.
2. WatchBuilder® is a total security tracking software fully managed and hosted servers, with guaranteed 99% uptime. We can better serve you upon your request.


Fully licensed software for:
• Personal safety monitoring and protection
• Real time tracking monitoring and management
• Healthy monitoring and management

Supported components:
• Fully your own brand and logo
• Admin Management center
• Agency Management center
• Billing/recurring invoicing system
• Open API to integrate in your CRM/ERP
• End user console
• mobile Web/App

Core Features

Support multiple device protocols. Accomodate most of the main current trackers from difference suppliers(Happy to add more devices as required)

• Global coverage cloudy server
• Seperate Admin/Agent/End User Login
• Realtime tracking with historical play back for up to 120 days
• Remote control features such as restore, remotely reboot, shutdown...
• Circle, retangel, polygon geofence in/out alarming
• Email Notification on alarming(Support add SMS features as required)
• Blood pressure, Blood oxygen , Heart rate, Pedometer, Sleep time monitor and remind
• Billing system and payment account
• Open API for integrate in third party system
• Customizable mobile(iOS and Android) app for tracking
• Customized reporting modules(Happy to add more as required)
• Multilingual languages(Happy to add addtional language as required)

Get peace of mind with Senior Smart Watches

If you need a senior smart watch for your family or friends, you are at the right place. Our smart watches range comes with the option of personal alarms, allowing you to have complete control over the situation in case a medical emergency arise. Senior smart watches enable elderly people to stay independent and offer peace of mind to the family. The watches are extremely lightweight and portable.


SOS Activating, How do they work?

How to triggering? just press SOS button & hold it then the watch activating SOS mode in 3 seconds automatically


Lone worker support

Employers have the responsibility to provide a safe working environment for their employees. Of course, this also includes lone workers who might spend extended amounts of time off site and alone thus exposed to more risks around personal safety. Whether your employees are regularly in situations where exposure to violence or confrontation is high or you are trying to implement preventative measures for your traveling workforce, we are here to help.

G1-style Senior Smartwatch

Why? G1-style SmartWatch

This senior watch combines 24hours heart rate monitor, blood pressure monitor, sedentary reminder, SOS, two-way phonew calls, GPS tracking features together, keeps your loved are always connected, and you can well know more about their health anytime and anywhere. You can rest easy knowing that you, along with all their other pre-approved emergency contacts, will be alerted via an SOS button if your senior loved one needs assistance.

We do for your health & safety life

We're a passionate team dedicated to developing tracking technology products that help improve people's lives. While keeping track of al the things which keep your life moving can be stressful, we feel it doesn't have to be. We believe you can live stress free, save time and money and feel empowered along the way.


3G WCDMA/4G LTE gps sos adult smart watch sos panic button elderly alarm system

• Fall down alarm
• Health & Location monitoring
• SOS Calling
• Waterproof

Core Features

• Display : high resolution touch LCD 1.3" 360*360
• Material : PC+ABS+Ceramics
• Battery : Lithium pollymer battery 700mA
• Operating System : RTOS Ultra high performance
• Processor : 1GHZ CPU+1G DDR RAM
• Frequency Band : GSM (900,1800), 3G WCDMA (B1,B8), 4G FDD (B1,B3,B7,B8), TDD (B38,B39,B40,B41)
• Bluetooth : BLE5.0
• SIM Card : 1 Nano SIM Card slot
• Health Sensor : Heartrate, Bloody pressure, SPO2, Body temperature
• Others : Steps Counting, GPS Positioning, 2-Way Call, SOS Alarm, GEO-fence



SmartWatch introduce and features video playlist

USB 2.0 UAC - audio mixer

USB 2.0 AUDIO CLASS, DJmix5300 audio mixer

The DJmix5300 is a comprehensive device and digitally enhanced playback & record audio mixer allows to user create audio content easily such as real time mixing PC playback sound and Microphone/or Line input signal. We also provide integration to control 8 Bits ADC corssfader. Support Standard USB plug & Play function at the Running Windows/Mac OS Desktop or Laptop PC. No required specific driver installation. We can better serve you upon your request.

Core Features

● OPENCAST Stereo mix audo pipe line thechnology inside
● Materials : Aluminium alloy and silk printed
● Power Supply : USB 5V Self-powered
● USB I/F : USB A type - Micro 5p Cable
● Audio I/F : 3.5mm JACK - 1. Headphone out, 2. Line out, 3. Microphone Input, 4. Line input
● Fader : Micriophone Gain, Line input, Echo effect, Crossfade
● Resolution : 2CH DAC 24Bit / 2CH ADC 24Bit

Where to buy

Domestic only Click Order form


Design and manufacturing by OPENCAST Team in KOREA


DJMIX#5300 introduce and features video playlist

Contact us

We are always happy to hear from you If you have any questions, suggestions about our product, please feel free to contact us. Your suggestions will be of great importance for us to improve the service & products please contact us at : comodomusic@naver.com

For any information, contact us using the email address or call us.


RM#B04, 8-4, Balibongnam-ro 25beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, Republic of Korea 13601
Monday - Friday (9.00 AM - 5.00 PM)
Call us (031)752 4367
International +82.(0)10.2656.4367


얼마나 기다렸나
너절한 과거와 이별할 그 날을
홀로의 계절을 박차고 나와서
우리로 만날 날을

얼마나 기다렸나
해묵은 기억과 이별할 그 날을
옛날의 그이는 묻어두고
새로이 태어나는 날을

인생을 안다면 신선이라
어찌 사람이겠소
배 위에 이 한 몸 올랐으니
어디라도 가보자 oh

아티스트: 안예은