This is the Traxxas X-Maxx Velineon VXL-8s Waterproof ESC. The Velineon VXL-8s forward/reverse electronic speed control simplifies brushless technology with easy, built-in profiles and intuitive programming. The VXL-8s uses advanced circuit design that allows sensorless brushless motors to operate with the smoothness and precision of the best brushless systems. The VXL-8s comes with the peace-of-mind of the Traxxas Lifetime Electronics Warranty and unmatched Traxxas customer support.

The VXL-8s is not a toy. It is a sophisticated electronic device capable of delivering large amounts of current. Children under 14 years of age require adult supervision for use of the VXL-8s. 

Specifications: 
Input voltage: 4S/6S/8S LiPo (max. 33.6 volts) 
Supported motors: Sensorless brushless 
Battery connectors: Traxxas High-Current Connector 
Motor connectors: TRX 6.5mm bullet connectors 
Motor/battery wiring: 10-gauge Maxx® Cable 
Thermal protection: 2-stage thermal shutdown 
Case size (l/w/h): 58mm (2.28”)/ 72mm (2.83”)/ 46mm (1.81”) 
Weight: 182g (6.42oz)