This is an FMS 50-Amp Brushless ESC. This ESC is a direct replacement for the FMS 64mm F5, F18, F35, F15 and F16 ducted fan jets.

Specifications:
Cont. Current: 50A
Burst Current: 70A
BEC: 5.5 volts / 5 amps
Dimension: 31x58x11mm
Weight (Including wires and plugs): 45g
Battery cell: 5-18 Nickel 2-6 Lipo
Battery Plug: Dean / Male
Motor Plug: 3.5 mm bullet