# USB-921

> USB-921 (iPhone/iPad app by Merry-Link Co.,Ltd..)

- Source: https://appshunter.io/ios/app/usb-921/id1539400908 (this page in markdown: same URL + `.md`)
- Developer: [Merry-Link Co.,Ltd.](https://appshunter.io/developer/1040729128)
- Category: Utilities, Weather
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 201 MB
- Languages: American English
- Released: 2021-01-05
- Data updated: 2026-08-18
- User reviews in markdown: https://appshunter.io/ios/app/usb-921/id1539400908/reviews.md

## What is USB?

APP用來註冊設定USB-921 地震儀, 安裝地震儀用戶, 可接收【P波警報】,【特快報】,【地震快報】,【最大震度】推播通知


## Version history (last 5 releases)

### 3.2 — 2025-03-04

優化接收速度, 降低漏接情況

### 3.1 — 2024-12-17

優化接收速度, 降低漏接情況

### 3.0 — 2024-12-01

功能優化及問題修復

### 2.1 — 2024-09-01

功能優化及修復已知問題

### 2.0 — 2024-08-20

優化功能及調整文字

## Apps similar to USB

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [USB TPMS](https://appshunter.io/ios/app/usb-tpms/id1475728273) | 1.0 (1) | Free | Utilities |
| [SOWCH-ST188](https://appshunter.io/ios/app/sowch-st188/id6504475768) | — | Free | Utilities |
| [Wireless Tire Inspection](https://appshunter.io/ios/app/wireless-tire-inspection/id1542173798) | — | Free | Utilities |
| [SOWCH-ST940](https://appshunter.io/ios/app/sowch-st940/id1462877096) | — | Free | Utilities |

## More apps by Merry-Link Co.,Ltd.

- [SET_WiFi](https://appshunter.io/ios/app/set-wifi/id1560376732)
- [地震特快報](https://appshunter.io/ios/app/id6463813654)

All apps by Merry-Link Co.,Ltd.: https://appshunter.io/developer/1040729128

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-18.*