Wavelength: 650nm.Beam style��ocontinuous line.Preheat time: < 3seconds.Operating Voltage: DC3.7V with a key to protect.Switch: touch switch.Battery: 18650 can rechargeable batteries (Not included).Size:160mm*24mm*24mm.When you travel or adventure and need a pointer， it is a good choice. can also be used in laser pointer.With the child safety lock.Aviation aluminum alloy， durable.Friendly reminder: The laser is high power .So it runs out of battery quickly. And please don't keep the laser on continuously for more than 20 seconds or it will get burnt from inside easily.The use of the laser beam is absolutely does not allow the irradiation of the eye in front of humans and animals!Remove the batteries when not in use， put the child is not easy to get a place!