Remote control distance: 50 meters outdoorRemote frequency: 2.4GCan control the number of motors: 4Input voltage: 4-6vRemote control power supply: two 5th batteries (not included)1, keep the switch of the receiving board and the remote control in the off state,2, open the receiver board switch, turn on the remote control switch, then close the remote control to the receiving board, the red indicator light on the remote control flashes and then extinguish, indicating that the frequency is successful, if the flashing does not go out, please wait a little longer, or all shut down Try again.Reminder: only for small power motors, such as 130, high power motor will burncolour:blackMaterial:plasticsize:Receiver board size: 5.6 x 3.5cmPackage Contents:2 x receiving board2 x remote controlOnly the above package content, other products are not included.Note: Light 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.