Hi guys. I have just purchased this gizmo for my rock climbing and I realised this would make an awesome signalling device. GREEN LASER: MOD NOTE: Video showing illegal use of green laser against pilots removed. They can be powered either from AA batteries or rechargable 18650 so you can even keep tis device empty and use your torch batteries in an emergency. And they cost around £5! -Small and light. -Doesn't expire. -Can be seen for literally miles. -Fantastic targeting. -The cloudier the better really. -Last hours. I know it's not perfect but in my opinion sooooo much more effective than spinning a light stick or a 5 sec flare. I would love your thoughts and a discussion.