This is the high performance E-Flite 20-Amp Mini ESC.  This ESC is great for Speed 400 and smaller motors.  It comes pre-wired with connectors.

Features:

• For use with Speed 400 motors and below
• Proportional forward w/brake
• 20-amp continuous current
• Thermal overload protection
• Auto cut-off with BEC
• Prewired with connectors

Specifications:
Forward: Y
Brake: Y
Continuous Maximum Current: 20
Input Voltage: 6 - 12
Motor Limit: Up to Speed 400 Series
Dimensions (WxLxH): 1.14 x 0.68 x 0.26 in
Weight: .63 oz
Overload Protection: Y
Auto Cutoff: Y