755nm Long Pulsed Alexandrite Laser
755nm wavelength has high level of melanin absorption,and low absorption level of water and oxyhemoglobin, so 755nm wavelength can be effective on the target without specific damage on neighboring tissues.

1064nm Long Pulsed Nd:YAG Laser
Long pulse Nd:YAG has low absorption in melanin and deeper skin penetration due to its high energy.
It simulates dermis layer without damage of epidermis, rearranges collagen and thus improves loose skin and fine wrinkles