Feature:<br>1.4Poles design, high torque &amp; high efficiency. The overall efficiency exceed 90 percent.<br>2.Low heat production, long lifetime, strong overload protection and it can function 95% of its features without any heat sink appliance.<br>3.high quality materials adopted: high intense aluminum alloy anodizing shell , front &amp; back cover , high-performance temperature-resistant magnetic steel and imported high-speed bearing<br><br>Specifications:<br>Model: 3670<br>Dimension: R36 * 70mm<br>KV(RPM/V): 2150KV<br>Poles: 4<br>Watts: 1600W<br>Max voltage: &lt;23V<br>Max Amps: 70A<br>Shaft diameter: 5mm<br>Recommend model: 1/10,1/8 RC Car,Boat<br>Package size: 9.5 * 8 * 6.3cm / 3.7 * 3.1 * 2.5in<br>Package weight: 304g / 10.7oz<br><br>Package list:<br>1 * 3670 4Poles 2150KV BL Brushless Motor