Will code plug into the receiver battery channel, battery (or any other unused channel connected to electric the tune power) insert the receiver lamp is not lit.The transmitter is set to a non runaway protection status (general throttle lever to the lowest it), press and hold the transmitter high frequency head lights and turn on the transmitter power LED lights shining in the the transmitter LED high frequency head, a few seconds, the receiver LED lights shining, shining stop frequency completed.The new receiver simply code the code after use to remove the plug on the code.Number of channels: 6Modulation: for DSM2Frequency: 2.4 GHzSize: 32 x 22 x 12mmWeight: 7.8g Range: 3.5v - 9.6vAntenna length: 30mm / eachColour:As ShownMaterial:plasticPackage Contents:1 x DSM2 RC ReceiverOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.