Package include1x laser pen5x pen heads (Not include battery)Specification:max output power<1mWwavelebgth 532nm・10class III laser productthis product complies with 21CFR.Attention:avoid exposure laser.light is emitted from the aperture.laser radiation、avoid direct eye exposure.The laser light time is not recommended for more than 1 minute、 due to overheating or affect the service life of laser!If it is found that the brightness of laser beam to reduce seriously、 please pay attention to the battery charging or battery replacement.