The application to which the time of the electric wave clock is adjusted.
JJYEmulator is a TOOLS app that enables audio-based time synchronization between your smartphone and an external clock. It guides users to place headphone speakers near the clock’s internal antenna and can complete the sync within 2 to 3 minutes, using the phone’s time as the reference. Not ranked in any top list, the app holds a strong rating of 4.73 from 1,029 reviews and 100,000+ total downloads, with 1.8K in the last 30 days.
Pros & Cons
Niche, audio-based time synchronization using the phone as the reference clock
Free to use with standard ad/analytics libraries (AdMob, Firebase) enabled
Mature app age (4188 days) suggesting stability and long-term support
Clear setup guidance for positioning around the clock’s antenna and using volume effectively
Relies on an audio-based sync method rather than automatic network time synchronization
Requires manual steps and hardware placement (headphones near the clock) for proper operation
Lacks modern features common in competitors (e.g., digital displays, smartwatch compatibility, widgets)
About JJYEmulator
JJYEmulator is a tools app developed by mokyuu.
How many times has JJYEmulator been downloaded?
JJYEmulator has been downloaded 270 thousand times. In the last 30 days, the app was downloaded 1.8 thousand times.
What is the rating of JJYEmulator?
JJYEmulator is rated 4.74 out of 5 stars, based on 1 thousand ratings.
Is JJYEmulator free?
JJYEmulator is free to download. The APK download size is 7.49 MB. The latest version available is 1.6.3. The last update was on July 3, 2025.
What are the requirements for JJYEmulator?
JJYEmulator requires Android 2.3+ or higher. The app has a content rating of Everyone. The app has been available on Google Play December 2014.
Description
Note We will receive more emails requesting radio clocks from other countries, but since you can not create it without materials, please attach the clear material you need.
It outlines the steps to transmit the time sync audio beeps with headphones to the watch, which after a few minutes, results with the watch being synced as if the watch owner was actually in Japan.
This application synchronizes with the time of your smartphone. To synchronize the time accurately, it is recommended to use a time synchronization application etc. to make the time of your smartphone accurate.
Place headphone speakers by the atomic radio clock’s internal antenna, with the volume as high as possible before it starts to distort. Or, place the clock’s internal radio antenna as close as possible to the smartphone speaker. Again, with the volume as high as possible before it starts to distort. When time sync receive mode is active, the clock will sync within 2 to 3 minutes.
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This Application works Perfect :) Please do the followings in your smartphone: 1) Select "Airplane Mode" - neither Wi-Fi nor 3G/4G/5G available 2) go to "settings" ->Date time 2a) disable "Use network provided time" 2b) disable "network-provided time zone 2c) select timezone as Japan 2d) enter your local country current date 2e) enter your local country time all above settings - will cause this app to fill in Japan however with your local Date & Time settings 3) activate this amazing Emulator mobile app 4) set full volume and put your Radio-Controlled watch as near as possible to your smartphone 5) long press (2 Sec) on button an on your watch - verify the Sec hand move towards the "RX" sign 6) Wait for about 3-4 Minutes (This app. Will communicate with the watch and transfer the Date/Time 12/24 Year... data) once the watch complete to receive all the Atomic Date&Time data, the hands will move to correct Time and the Date will be automatically fixed 7) once the Sec hand start moving in normal mode, your radio-controlled watch was already set 8) Enjoy Your Time
★★★★★Patrick Beal· Aug 2, 2023
Works perfectly. Leave it at high volume with the phone speaker close to the 12 o'clock side of your Casio MultiBand 6 and the city set to TYO, then after sync revert to your location.
★★★★★Gene F· Mar 16, 2019
This is the best for JJY clocks!! A few years ago I bought some very nice Casio clocks sold only in Japan, but they were only made for the Japanese market and only could use JJY. Even if I could at times get the JJY 40 signal, it would set my clock to JST. Now I can buy these nice clocks from Amazon.jp and your app will set my clock using JJY emulator to my Galaxy S9's clock. Thank you for a very nice app! 👍 Update: I tried an out few others apps and while they might do the same thing, they miss details like the correct date or the server they use is 2 seconds off. So in the end, your app does the best job.
★☆☆☆☆B. Bluebriz· Nov 28, 2022
Doesn't work on my Casio watch inside Japan.
★☆☆☆☆Ramy Ebeid· Sep 9, 2022
Keeps getting Japan time not local, signal is great and watch gets it really clear but not local time
★☆☆☆☆trayan dimitrov· Apr 13, 2025
, radio waves and sound waves are fundamentally different. Radio waves are electromagnetic waves, which can travel through a vacuum, while sound waves are mechanical waves that require a medium like air to travel. Radio waves are too quiet for humans to hear, requiring special devices like radios to convert them into audible sound, whereas we can directly hear sound waves
Google Play Rankings for JJYEmulator
This app is not ranked
Technologies used by JJYEmulator
JJYEmulator is requesting 9 permissions and is using 4 libraries.
Show details
Trust & Safety: Permissions include network state, Internet, wake lock, foreground service, and advertising IDs (com.google.android.gms.permission.AD_ID), along with AdMob/Firebase-related capabilities. This pattern is typical for ad-supported tools and does not indicate access to sensitive user data beyond standard app advertising and background operation.
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