https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions
Product Info
S11 Smoke Detector

S11 Smoke Detector

Shenzhen P&H Electronic Co., Ltd.
Region: China
Update: 05/09/2012
Key Specifications
Features: 

● Designed to comply with Japan NS standard 

● Polished low-profile housing design 

● * Built-in sounder with high dB level of 85dB 

● Durable sensor head, excellent smoke access 

● Manual test with sound & flash alarm

https://www.asmag.com/project/resource/index.aspx?aid=16&t=secutech-made-in-taiwan-products-and-solutions