Product name:GTSKYTENRC Waterproof Combo F540 4370KV Brushless Motor w/ 45A ESC for 1/10 RC Tamiya Axial Redcat ECS: Specially designed for RC car with excellent start-up, acceleration and linearity features. Compatible with sensorless brushless motor. The strong resistant current capability, excellent heat dissipation. Multiple protection features: Low voltage cut-off protection for litium or nickel battery /Over-heat protectionThrote signal loss protection / Motor blocked protection/. . Description: F540 Brushless Motor Description: Main Features KV value: 3300KV / 4370KV Watts: 820W Max voltage: less than 13V / 17V Max Amps: 60A / 47A Rotor poles: 4 IO: 2.4A / 1.9A Resistance: 0.0196 / 0.0285 Max RPM: 50000 Shaft: 3.175mm Length of extending shaft: 15mm Connector: 4.0mm gold Applicable models: 1:10 flat sports car 2 - 3s Description: Item Brand:Surpass Hobby Item Number:F540 Series Product Size:36*49.8mm Suitable Scale of Car/Battery:1/10 flat sports car 2 - 3s Color: red black Material: aluminum alloy 45A ESC Description: Specification: Name: 45A ESC Cont.Current/Burst Current: 45A/240A Motor Type: Sensorless Brushless Motor For 2S Lipo or 6 cells NiMH : 1. on-road: 3650-Size or smaller motor with the KV