Specification:Type: PenModel: Laser PenLaser Color: GreenWavelength: 532nmBeam Style: Continuous LinePreheat Time: < 3 SecondsWorking Temperature: +15¡æ¡«+35¡æStorage Temperature: -10¡æ¡«+40¡æAviation Aluminum Alloy， DurableSurface Appearance Treatment: Anodized BlackStart-up Time: 3 SecondsOperating Voltage: DC3.7V (with a key to protect)Size: 2.5 x 2.5 x 16cm/0.98" x 0.98" x 6.30" (Approx.)Switch: Touch SwitchBattery: 18650 can Rechargeable Battery (Not Included)Output Power: < 1mwUSE NOTE:1. This laser is high power and will run out of battery quickly.2. Do not keep the laser on continuously for more than 20 seconds or it could burn from the inside.3. Never shine the laser beam into or even near the eyes of humans or animals. This can cause blindness.4. Children should use the laser beam under adult supervision only. Remove the battery when not in use and store in an out-of-way place to prevent unsupervised use by children.5. If you find that the brightness of the laser beam is reduced just charge or replace battery.Note: After putting the correct battery， please use the key to unlock the laser firstly and then press the button. If the laser fails to work， please flip the battery to try again. Sometimes， it will work if you flip the battery (put the battery oppositely).Package Included:1 x Laser Pointer Pen (Charger and Batteries Not included)1 x Safety Key (When it is on or off， it can be removed)1 x Hand Strap