237091 Brand new and high quality Very reasonable price， buy one here Battery support: Ni-MH， Ni-Cd 4 - 6 group ( 4.8 V ~ 7.2 V ); lithium battery 3 groups ( 7.4 V - 11.1 V ) Current parameters: forward 320 A， reverse 160 A， brake 270 A BEC output: voltage 5.6 V， current 2 A ( supply electricity for receivers， servos ) Size: 43 x 29 x 27 mm Features: 1. Automatically find the center position 2. High-frequency drive system 3. Low-resistance field effect tube 4. Applies to cars， boats models Instructions: 1. Connect to the power battery correctly， the red wires at both ends of this wiring boards are positive， black ones are negative. ( or connect to a standard DC battery plug male plug / T plug / banana plug ) 2. The output red and black lines of ESC need to be connected to the red and black lines of car 540 motor 3. Open the ESC power switch， then the motor produces a "beep" sound， and then turn on the transmitter power， the motor will produce a "duo - la - mi" sound which proves that the remote control signal and ESC have been successfully connected 1 x ESC