[Simple connection]: For a three wire (single acting) tipper trailer controller: Use a wire with a metal circular end to connect to the lowering valve. Connect the positive terminal of the battery to the using the circled wire. 3 wires - red (power), blue (raised), and black (guide) [ materials ]: A good structure and can be used for a long time [Save money]: The remote switch of the dump truck trailer saves time and money. There is no need to call the hydraulic dump truck trailer controller dealer, just install our 3-wire dump truck trailer remote control switch [ Design]: A 15 foot long rope is long enough to stand behind the dump trailer switch when unloading goods. Perfect for lifting or lowering things. Widely used: Suitable for 12 volt DC dump trucks, dump trucks, lifting doors, lifting dump trucks, elevators, stackers, etc size: 4.5m Material: plastic colour: Package Contents: 1 x Trailer Remote Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.