Feature: 1. 4 Pole 12 Slot: The motor is 4 pole 12 slot high torque motor designed, CNC machining 6061 T6 billet aluminum tank. 2. High Purity Copper Winding: High purity copper winding maximizes efficiency. High speed ABEC5 super large bearing. 3. Accurate Balanced Rotor: Accurate balanced rotor with better smoothness can provide better reliability and maximum speed. It is applicable to multiple mounting system of all 1/10 brushless automobile M3 screws. 4. 0.35mm Stator Lamination: Ultra thin 0.35mm stator lamination, removable and replaceable rotor, accurate design, to achieve maximum energy conversion. 5. Multiple Protection: Multiple protection functions, battery low voltage cut off protection, overheat signal loss protection, motor stall protection. Strong current resistance, excellent heat dissipation, easy programming and compatible with pocket programming card. Specification: Item Type: RC Brushless Motor and ESC Material: Aluminum alloy, copper, steel and plastic Gross Weight: 295g/10.4oz Color: Black red Model: F540 KV, RPM/V: 3000KV Wattage: 820W Maximum Voltage: ＜ 18V Maximum Current: 45A Maximum Speed: 50000 No Load Current: 1.3A Number of Motor Poles: 4 Internal Resistance: 0.0355Ω Motor Length: 50mm/2.0in, excluding shaft Motor Diameter: 36mm/1.4in Shaft Diameter: 3.175mm/0.12in Shaft Length: 15mm/0.59in Gold Plated Plug: 4.0mm/0.16in 45A ESC: Continuous, Breaking Current: 45A, 240A Motor Type: Sensorless brushless motor For lipo 2s or 6 nimh cells: 1. Highway: 3650 size or smaller engines with kv<5600kv 2. Off Road Vehicle: 3660 size or smaller engine with kv<3800kv For lipo 3s or 9 nimh cells: 1. Highway: 3660 size or smaller engines with kv<3800kv 2. Off Road, Off Road Vehicle, Monster: 3660 size or smaller engine with kv<2600kv Battery: 2-3s li po, 4-9s nimh nicd BEC Output: 5.8V 3A, switching mode Power Plug: T plug male Resistance: 0.0014ohm Size: 51.5x38.5x38.5mm/2.0x1.5x1.5in Applicable to: All 1/10 brushless vehicles. Package List: 1 x RC Brushless Motor1 x RC ESC2 x Manual Note: 1. Please allow 1 to 3mm error due to manual measurement, thank you!2. Due to the difference between different monitors, the picture may not reflect the actual color of the item.