Dual speed crane control, which is designed for industrial use.Data is checked via a linking code and the resulting movements are carried out using the high performance CPU.The data checker communicates via a high frequency element. All units are small & stable with a powerful anti-interference feature, which is possible because they are packed with high-precision SMD. Range in open area is up to 100m; Power supply is 2 AAA batteries; Output interface:Relay 12V,5A; Direction:Omnidirection; Has two speed. Contact us for more deails of dual speed crane control.