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Voice-activated switch with self-locking function
Source: InternetPublisher:super_star Updated: 2015/03/23
![具有自锁功能的声控开关](http://www.eeworld.com.cn/circuit/upload/538a1bc8a409ff500dc8e0cb6c6d7ecb/2b58424a-3c64-11ec-a15e-086126841eb8.jpg)
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