This product is green laser. by its own characteristics is outside interference of small and highly sensitive and all the dim light is to capture the light of the track. Product model:BT-L801 Standard sizes:Φ25.4x120 Power: 5mW/10mW/20mW/30mW/50mW Working environment: DC=3.0V,-10°C——+45°C Working Life:5000-10000h