... time during performance. Impossible & no worry about scorching head ,hair &skin even operated carelessly.3. Non-stickCold melting by ... typessuitable for many types of hair extension systems,( keratin silky straight hair, prebonded -hair, hair bonding, nail hair and stick hair)8.Humanised designHandy,graceful ... 11.LED sigitalrLED displays the digital parameters. black ultrasonic hair extension machine