This receiver will code into the receiver's battery channel. If the battery (or any other unused channel connected to the electrical tuning effect) is set in the receiver, the lamp will not light up. The transmitter is set to a non-protected status (general gas regulation to the lowest level), press and hold the transmitter's high-frequency main lamps, and turn on the transmitter's power. The LED lamps in the transmitter's high-frequency main will light up for a few seconds, the receiver's LED lamps will light up, and the stop frequency will be completed. The new receiver simply codes the code after use to remove the contact on the code. Number of channels: 6 Modulation: DSM2 Frequency: 2.4 GHz Dimensions: 32 x 22 x 12mm Weight: 7.8g Voltage range: 3.5v - 9.6v Antenna length: 30mm / each Color: As shown Material: Plastic Package contents: 1 x DSM2 RC receiver Only the above package contents are included, other products are not included. Note: Light reflection and different screens may cause the color of the object in the image to slightly differ from the actual. The allowed measurement error is +/- 1-3cm.