Needle destroyer features: Electrodes made from peculiar heat-resisting material can work for long time, too low working voltage7vinsures the operators safety. After melting the needle, then meld the syringe tube, all work finish in one time, easy and safe. The controlling curcuit desgned for safety insures the operators safety. Very simple operation Empty the liquid in the syringe during use, then insert the needly into hole to melt the needly first, and then move toward the left cutting hilt. (refer to s 7, 8). It needs totally 6 seconds to destroy the syringe and needle. Convenient to carry, work with ac. Portable desisn can be directly moved, model bd-310 can directly use ac220, convenient to supply electricity.