Shoot a beam of green light a full mile into the night sky ?§C and point out your stargazing finds to friends. Clearly visible even in bright light, this continuous wave laser appears 30x to 5000x brighter than red beams. Features: 1. 30-5000x brighter than a red laser 2. Beam can be seen in midair 3. Brass body with black matte finish 4. Output power: 50mW,100mW,150mW 5. Wavelength: 532nm 6. High-quality lens emits a focused round spot 7. Pocket clip for portability 8. Push-button beam function 9. Battery life: approx. four hours 10. 2 month manufacturer's warranty With impressive power, this green laser is completely safe and is a great accessory for astronomy-lovers.