CITIZEN Bluetooth Watch
v1.2.240 · 38.1 MB · code 2000000240
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File information
UpdatedApr 9, 2026
PublishedJul 9, 2021
Packagejp.co.citizen.cal.w770
Versionv1.2.240 (2000000240)
Size38.1 MB
MD5abd1a8261d7f2b571dc2299e2f2b76a9
Min SDK22
Malware scanTRUSTED
Signature SHA1A4:EA:09:FC:44:C0:EF:D4:31:B5:3A:31:61:69:7A:60:9A:A9:56:D8
SignerCN=Daisuke Matsuoh, OU=Advanced Depertment, O=Citizen Watch, L=Nishi-Tokyo, ST=Tokyo, C=JP
Total downloads50,000
This version50,000
DeveloperCITIZEN WATCH CO.,LTD
Age ratingEveryone
What's new in v1.2.240
- Change of specifications related with “X notification function”
- Change of specifications related with “Light Level”.
- Some minor maintenance and bug fixes.
- Change of specifications related with “Light Level”.
- Some minor maintenance and bug fixes.
Security scan
TRUSTED
- Developer signature verified 2026-04-09
- Signature SHA1 A4:EA:09:FC:44:C0:EF:D4:31:B5:3A:31:61:69:7A:60:9A:A9:56:D8
- File MD5 abd1a8261d7f2b571dc2299e2f2b76a9
How to install CITIZEN Bluetooth Watch v1.2.240 on Android 5.1 Lollipop+
Takes about 2 minutes. You'll need roughly 38.1 MB of free storage.
- Grab jp.co.citizen.cal.w770_2000000240.apk — hit the Download button above (38.1 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches abd1a8261d7f2b57…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find jp.co.citizen.cal.w770_2000000240.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Daisuke Matsuoh, OU=Advanced Depertment, O=Citizen Watch, L=Nishi-Tokyo, ST=Tokyo, C=JP. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open CITIZEN Bluetooth Watch — tap Open on the install screen, or find the CITIZEN Bluetooth Watch icon in your app drawer.
Common install errors for CITIZEN Bluetooth Watch
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android 5.1 Lollipop or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.