Specification :

The Lindhualarm is a tool Lindhu marker of waves of the earth ( earthquake) which is destructive and dangerous to human safety
This marker tool uses a mechanical sensor and equipped with speakers that will sound loud enough in the event of an earthquake. This bookmark tool does not require special treatment ( Maintenance Free) because it is made from materials that are not easily broken ( corrosive and rusting) assembly technique is taped to the wall with a vertical position.
This tool will not ring if there is vibration caused by the vibration of the local objects such as vehicles. because the tool is already equipped with sophisticated sensors that can detect earthquakes