LASER HAIR REMOVAL: 755 nm for fair skin and light hair hair removal . 808 nm suitable for for a wide range of skin types and hair colors 1064 nm suitable for dark skin hair removal . 940 nm its penetration depth that makes it suitable for treating all hair types. Melanin absorption is low, making it very safe for working with dark skin types. ADVANTAGES: 1. Stable and high power Coherent laser bars module  2 Italy imported water pump with better cooling system and more quiet 3 Six way power supply, much higher and stable output 4 TEC cooling system can control water temperature, running continuously within 36 hours continuously