> <i>Firing it for 10 seconds is the cost equivalent of using a regular heater for just an hour. Therefore, it has the potential to be a long-term low-cost alternative to certain tasks missiles currently carry out. The cost of operating the laser is typically less than £10 per shot.</i><p>I wonder how much damage one shot could do. Sounds like a good price point at £10. Also curious what kind of batteries they have behind these things.