50mW 650nm UltraFire WF-501B Flashlight Style Laser Red ,$18

The functions in pen are all different!
Specifications
Key Features     Red laser pointer
Laser color     Red
Laser wave length     650nm
Laser output power     200mW
Light style     Beam light
Power supply     1 x CR123 battery
Switch     Button
Body material     Metal
Body color     Black
Operation voltage     3V
Service life     8000 - 10000h
Dimension     1.5" x 7.1" (Dia. x L)
Beam divergence angle     < 1.5
Beam diameter     < 1.0m
Working mode     Continuous wave
Working temperature     0℃ ~ 40℃
Product weight     6.88 oz
http://www.tmart.com/50mW-650nm-UltraFire-WF501B-Flashlight-Style-Red-Laser-Pointer-1CR123_p109215.html