This is the Castle Creations Sidewinder SV3 WP 1/10 ESC and Brushless Motor Combo, including a Neu-Castle 1406 4600kV Brushless and Sensored Motor. Castle’s Sidewinder ESC is now waterproof! The Sidewinder 3 can power crawlers on water filled trails, AWD's in rain soaked parking lots, and SCT's on adventures through muddy fields. Drivers can now give in to those irresistible urges to drive in the mud or rip through puddles without damaging their ESC. 

Designed for 1/10th 
The Sidewinder 3 is a great fit for 1/10th off-road, on-road, and rock crawlers running up to 3S LiPo. It features updated circuitry for faster response time and improved reliability. As always, the Sidewinder 3 offers industry-leading software functions and USB programming capability via Castle Link USB adapter (sold separately). You asked. Castle listened. 
For more than a decade Castle has been providing award winning brushless sensorless motors to R/C enthusiasts worldwide. In response to overwhelming requests by their customers, Castle has brought technological advancements together that will deliver unprecedented performance in our their Sensored motor Line. ESC Specifications: 
Input Voltage: MIN: 2s LiPo; MAX: 3s LiPo 
Operating Environment: Waterproof* design allows for use in nearly any environment. 
Brake: Proportional 
Reversible: Yes - with lockout 
Size (LxWxH): 1.93x1.48x0.79" (49x38x20mm) 
Weight (w/127mm long battery wires and no battery connector): 1.96 oz (55.5g) *Not intended for operation while submerged in liquid. If unit is operated in wet conditions, rinse with fresh water to remove dirt or corrosives, then fully dry unit.   Motor Specifications: 
Input Voltage Range: 2-3S LiPo 
Kv: 4600 
Max. RPM: 100,000 
Size: Length: 49.5mm; Diameter: 36mm 
Weight (w/wires): 197 g / 6.9oz 
Shaft Size: Length: 15mm; Diameter: 1/8" (3.17mm) 
Mounting Hole Specifications: M3 @ 25mm 
Connectors: 4mm male Castle Bullet Connectors 
Application Guidelines: 1:10 scale 2WD SCT, on-road touring, stadium truck and buggies 
Max. Recommended Vehicle Weight: 2WD SCT Trucks up to 5lbs, stadium trucks, bugies, and on-road vehicles up to 4lbs. 
Tech Notes: Running modes: SMARTSENSE, Sensored, Sensorless