150W Nail Phototherapy Machine Professional LED Screen Dryer Lamp 42 UV Lights Drying Lamp Manicure Tool Salon Equipment

Q1: How do I know if the hair is human hair or synthetic hair?
Human hair has natural protein,it's easy to tell them apart by burning and smell.
(1)When human hair burns, it emits white smoke that smells like wool burning and turns to ash.
(2)When synthetic hair burned, it will turns into a sticky ball and emits black smoke.

Q2:How long does it last?
Normally it could last for over 2-3 years under good care.