Product Specification[Size]: ��4 �� 10mm[Material]: Copper[Surface Treatment / Color]: brass[Effect]: continuous dot output[Lifetime]> 10，000 hours[Output wavelength] : 650nm / �� 5nm[Output]: <5mW[Range]: <300M[Spot shape / diameter]: diameter <��18mm at 10 meters[Circuit control]: APC circuit[] Operating voltage: DC = 3.0 ~ 5.0V (2xAA batteries)[Work current]: <40mA[Operating temperature]: -10 �� ~ + 50 ��[Storage temperature]: -40 �� ~ + 80 ��Application:1. Can be used with positioning sight;2. Can be used in laser testing tools;3. Can be used for concentricity location;4. Can be used for medical equipment location;5. The device can be used to produce a signal;6. Love Yourself make small goods or for testing alternative teaching Amoy Friends goods.Precautions1， The laser is harmful to the eyes， do not aim at eyes irradiation power over 30mw red， do not expose to human directly (To protect the eyes can also wear laser safety goggles)2，Keep the product away from children， to prevent the improper use of hazardous by child. It is best to remove the battery when not in use.