639nm 220mW external laser module with lock
[Specification]
Wavelength: 639nm
Output Power:220mW
Operating Current: ≤300mA
Operating Voltage: DC 2.8-3.2（V）
Size: Φ16x60mm
Dot:
During the day, you can play 0-2100 meters indoors
During the day, you can hit 0-550 meters outdoors
In the dark it is possible to play 0-3100 meters
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