https://www.asmag.com/project/assa_abloy_digital_access_control/index.aspx
Product Info
Anvox Outdoor Battery Back-up Siren with Strobe

Anvox Outdoor Battery Back-up Siren with Strobe

Anvox Alarm Systems
Region: China
Update: 07/14/2011
Key Specifications
Features: 
● Two-way tamper switch protection
● Twin piezo sounders with 120 DB at one meter 
● Positive, negative siren trigger 
● Battery backup 
● LED diagnosis indication
https://www.asmag.com/project/dahua_xinghan_large-scale_ai_models/