Industrial Crane Wireless Remote Control F21-2S AC/DC65V-440V (1 Transmitter + 1 Receiver) Hoist with Single speed button Material is Glass-Fiber PA not plastic; Set the internal functions by computer interface; The cable is more safe and strong; Up/down, east/west. can be programmed to start, toggle or normal,ect; Label with laser marking Avoid the loss of important information(S/N,CH)