You want to get  a bright powerful laser that can be seen for miles.this is the ultra long range light
this one is very ok

Adjustable Focu Blue Laser Pointer Beam Light Visible Pen
Long Range Blue Laser Pointer Pen Visible Beam Light Lazer

PS: Do not keep the laser at a constant brightness Long time, otherwise it will easily burn out the internal crystal.

NOTE:Don't aim at the eyes

Package List:
1 x Long Range Laser Poienter Pen
5 x lamp holder
2 x Rechargeable Battery
1 x Charger

Specification:
material: metal
LED Color:Blue
Spot size: <φ10mm at 6M.
Laser range: Max 8000 meters.
Power supply: 2 x 16340/CR123-battery ( included)