# W21

> W21 (iPhone/iPad app by 传林 方.)

- Source: https://appshunter.io/ios/app/w21/id1390114438 (this page in markdown: same URL + `.md`)
- Developer: [传林 方](https://appshunter.io/developer/699727053)
- Category: Utilities, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 8.0 · 37 MB
- Languages: English, German, Japanese, Chinese
- Released: 2018-06-26
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/w21/id1390114438/reviews.md

## What is W21?

W21 is a multi-function alarm, can through the way of telephone or SMS control equipment, can also through the phone APP to control it.Can add the remote control on the equipment, magnetic door, infrared, such as accessories, installation area of the device in the event of an emergency it sets off the alarm at the same time through the APP send notifications to your phone.


## Version history (last 3 releases)

### 1.2 — 2019-07-07

Update some terms

### 1.1 — 2019-06-22

修复已知的Bug

### 1.0 — 2018-06-06

No release notes.

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| App | Rating | Price | Category |
| --- | --- | --- | --- |
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## More apps by 传林 方

- [GSM Smart Alarm System](https://appshunter.io/ios/app/gsm-smart-alarm-system/id896688363)
- [G19 Alarm System](https://appshunter.io/ios/app/g19-alarm-system/id958094154)
- [G18 Alarm System](https://appshunter.io/ios/app/g18-alarm-system/id1001001852)
- [S72](https://appshunter.io/ios/app/s72/id1016149071)
- [W2](https://appshunter.io/ios/app/w2/id1039606779)
- [W1 Alarm System](https://appshunter.io/ios/app/w1-alarm-system/id1041646478)

All apps by 传林 方: https://appshunter.io/developer/699727053

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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 2026-05-19.*