This is the Havoc Pro SC (Short Course) Brushless Electronic Speed Control with X-Drive from Novak. FEATURES: Updated with Novak X-Drive for enhanced throttle response, ultra smooth power delivery, higher top speed and cooler operating temperature Compatible with all Novak 540- and 550-size brushless motors Fourteen adjustable parameters: Minimum Brake, Drag Brake, Minimum Drive, Timing Level, Timing Set Point, Dead Band, Throttle Curve, Brake Curve, Brake Frequency, Brake End Point, Drive Frequency, Reverse, Motor Rotation, Voltage Cutoff, Hall Sensor Test Approved for ROAR Sportsman Class Racing Dynamic Timing Advance increases motor"s RPM dynamically through throttle band for higher speeds, eight on-board adjustments from 15°- 42°. NovaBrakes provides instantaneous braking under any timing condition with no delay Temperature indicator displays ESC"s temperature after each run via a blinking LED by tapping the One Touch button 3-amp BEC for strong and fast steering response Water resistant case 120 day limited warranty through manufacturer INCLUDES: Novak Havoc Pro SC (Short Course) ESC, cooling fan, shrink wrap, instruction sheet and zip ties REQUIRES: Compatible 540- or 550-size brushless motor SPECS: Input Voltage: 2S Li-Po cells, 2S Li-Fe cells or 4-6 NiMH cells (1.2V/cell) Size: 1.16 x 1.47" (29.5 x 37.3mm) Weight (without wires): 1.29oz. (36.6g) Design: Sensor-based Motor Limit (brushless): All 3.5-turn Novak 540-size and 4.5 turn 550 size sensored brushless motors On-Resistance (brushless): 0.00040 ohms @ 25°C trans. temp. BEC: 6.0 volts DC / 3.0 amps Status LEDs: 5 Power Wires: 14G super-flex copper-strand silicone wire jxs 07/20/10 ir/jxs updt jxs 12/14/11