While helping Christian look for the Whelens, I did some research online and discovered another system of sirens in Bhutan. This system is located east of the Whelen system and is comprised of 9 MasterBlaster looking electronic sirens. I’ve included some pictures of the activation center, software, and control/head pictures. Unfortunately, these units were installed after the most recent streetview, so no locations. I’m not going to try and find these using the garbage aerial view, but if any of you want to try, the central town that they're located near is right here. 27°23'01.49" N 90°31'37.36" E I also was able to locate a video of one activating, and to my surprise they’re dual tone! They almost remind me of an Alertronic. To hear them activate in alert, go to 1:25 https://www.facebook.com/JICABhutan/vid ... 712176748/
Here are some images of the installs, controllers, software and activation room.