Sensor-based for excellent torque and low-speed driveability; Compatible with any sensored/sensorless ESC. High RPM precision bearings; CNC machined billet T6 aluminum heatsink can. High purity copper windings maximizes conductivity; High power solder tabs. Removable/Replaceable rotor; Powerful sintered neodymium magnet. Precision engineered for maximum energy conversion. Turns: 8.5 KV: 4100KV Max current: 80A Resistance: 0.0138 Watts: 340 Shaft diameter: 3.17mm Weight: 172g Turns: 10.5 KV: 3450KV Max current: 63A Resistance: 0.0208 Watts: 250 Shaft diameter: 3.17mm Weight: 166g Turns: 13.5T Max Current: 49A Watts: 190W Can Diameter: 36mm Can Length: 50mm Shaft Diameter: 3.175mm Shaft Length: 13mm Weight: 173g/6.1oz Max voltage: 3.7V(1S)-11.1V(3S) Color: Blue Material: Aluminum alloy Item name: Sensored brushless motor Size: 540 Battery: 1-3S LiPo battery Sensored: Yes Package List: 1 * 540 Motor 1 * Connecting Cable Note: Light reflection 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.