receiver board working input voltage:DC 3.6V-6V This kit very good, it can control high power motor, it good for tank ,ship, car. we have make video. Notice:When the ship is remotely controlled, the remote control distance be affected by the water level and the height difference of the water . Remote Controller RC Boat Cars Controller mitter Receiver 6CH 2.4G mitter Receiver RC Boat mitter Receiver colour:black Material:plastic Size:Receiving board size: 4.5cmx4cmx0.9cm Package Contents: 1* remote control (without battery) 1* receiving board 4 *output cables 1 *screwdriver Only 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.