When it comes to remote controllers precision and the ability to adapt are the factors that matter the most. We've reviewed hundreds of RC transmitter models and came up with 15 amazing receivers available on the market. The steering servo would typically be connected to channel one, while the speed controller for the throttle would typically be attached to channel 2. On televisions with a third or fourth channel, they are typically used to control remote lighting or a winch. A reliable wireless data link between your hand controllers and the model is required for remote operation. Thankfully, the days of employing interference-prone narrow-band 27/35/40 Mhz crystals are behind us. Most transmitters are pre-bound (attached) to their corresponding receivers when they are sent, but if you ever need to replace any of the parts in the box, you will need to follow these instructions to rebind the transmitters. Charged batteries in the transmitter and receiver, as well as the ability to reach the receiver (by opening the lid, for example), are required for this. You may fine-tune the transmitter inputs by adjusting the trim. When your remote-control car isn't tracking straight, simply turn this dial. In the example below, the trim has been turned counter-clockwise to turn the steering wheel to the left, correcting for a servo/servo-horn that is installed about a spline out. Keep in mind that the steering is moving on its own. All the radio transmitters here are versatile, ergonomic, able to handle few programmed devices, have decent price and positive customers' reviews. Have fun!