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Ultra bright green light pen: shooting distance over 1500 meters at night. This product is short and easy to carry. 【100% brand new & high quality】 High quality metal alloy shell, strong and durable Children's Lock Green Light Pen]: Turn the switch to red or green dots and turn it off or on anytime and anywhere. 【Different types of batteries can be used】High-quality portable batteries can work or play with you at any time. You can use 18650 or 16340 rechargeable lithium batteries in our green range pen. 【Ultra-long distance】High quality portable green light pen can work or play with you at any time. It's output is well over 5 mw. You can use it to indicate constellations and where astronomical objects are in the sky. 【Ultra bright green pen】 Even at noon, you can s e e the trajectory of the beam. At night, the distance of the beam is more than 1500-10000 meters. It is a adjustable beam. It can be amplified and reduced by R e-fixing the light cap. If you buy it, you will get: 1 Green Light Pen 1 18650 Battery 1 Battery Charger 2 Keys