you are looking the longest blue laser pointer,take this one,may be the best choice
It may be the Long Rangest Range in  the market,UP TO 13000METER
 Blue Laser Pointer Pen Rechargeable Visible Beam Light Lazer

NOTE:Don't aim at the eyes

Specifications
-Color: black
-Length: 14.17 inch(36cm)
-Diameter: 1.4 inch(3.6cm)
-Portable box size: 25.5 * 18.5 * 6.5cm
-Material: aluminum
-Surface treatment: anodizing
-Switching mode: tail button switch
-Battery:2PCS Rechargeable battery
-Wavelength: 450nm
Mode: Hard Light,Low Light,Burst
-Beam size: 500-13000m
-Working voltage: DC7.4V
-Adjustable focal length
-Charger input: AC 100V-240V, 50/60Hz, maximum 150mA
-Charger output: DC 4.2V 650mAh
Weight with gift box:about:1.1KG

Package Included:

1x Super Long Range Blue laser
5x Lamp cap
2x Rechargeable batteries
1x Charger
1x Coggles
1x Metal Gift box

Note:
1: Pay attention to the polarity when installing the battery. Wrong installation will result in no output.
2: Please do not aim the laser at people, especially eyes!
3: Please lock the pointer and take out the battery when storing the laser pointer.