HSA 3500 Yale Burglar Alarm Siren: How to Power with a USB Charger

HSA 3500 Yale Burglar Alarm Siren: How to Power with a USB Charger (#269)
Yale Model: HSA 3500
Contents
1. Overview and Planning
2. How to connect at Yale Alarm Siren and At Charger side
3. "Lab" Testing
4. How to Install
Warning: this job involves dangerous 240v voltage!!!
How to power an external siren with a USB charger?
Although the USB charger provides 5 volts and the Siren required 6 volts, but the siren works fine with 5 volts.
I also added two always-on blue LEDs behind the lens, which are great for me and the burglars to see.
Hey, you never need to change the batteries again!
Hope this help someone!
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