Inclusion Criteria:  Age above 18 years General anesthesia that needs endotracheal intubation All Mallampati score 1-3 ASA physical status 1-3  Exclusion Criteria:  Refuse or unable to sign the consent. Pregnancy Emergency cases History of or expected difficult intubation Maxillofacial abnormality or trauma Age below 18 years Rapid sequence induction Skin disorders and skin light sensitivity (SLE, Lupus ….) Impaired head and neck mobility Scars or skin injuries at the neck