This is the Castle Creations Mamba Monster X
Waterproof Electronic Speed Control.

FEATURES: For 1/8 scale buggies, truggies and on-road vehicles, and 1/10 scale
monster trucks weighing up to 15lbs (6.8kg)
2S-6S LiPo compatible
Adjustable BEC (battery eliminator circuit) 5.5V, 6.0V, 7.5V, or 8.0V
8A Peak), default 5.5V
Profiles can be custom designed on a PC with the Castle Link
PC programming software (software not included, can be
downloaded for free from Castle's website, voucher is included for
free Castle Link Programmer)
Castle Link Adjustable settings include;
Brake/Reverse Type
LiPo Cutoff Voltage
Brake Amount
Drag Brake
Motor Type
Programmable Auxiliary Wire (AUX) allows adjustments to several
settings such as torque control and max throttle from a compatible
transmitter
Sensored motor capable with purchase of optional (not included)
Sensor harness from Castle Creations
Telemetry ready with purchase of Castle Creations S.BUS Telemetry
Link
One year limited warranty through Castle Creations beginning at date
of purchase

INCLUDES: Castle Creations Mamba Monster X ESC with On/Off Switch, pretinned
Battery Leads, Receiver Connector, Female Motor Connectors, 30mm
Cooling Fan and Instruction Booklet
Voucher for free Castle Link Programmer

REQUIRES: Compatible Motor and LiPo Battery
Battery Connectors, Castle Creations 6.5mm are recommended

SPECS: Input Voltage Range: Min. 2S LiPo, Max. 6S, 25.2V
BEC Specifications: Adjustable: 5.5V or 7.5V (2A Peak), default 5.5V
Brake: Proportional
Reversible: Yes, with lockout
On/Off Switch: Yes
Dimensions: 2.08 x 1.9" (53 x 49mm)
Weight: 3.91oz (111.1g) with wires

COMMENTS: 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. Cooling fan is not
waterproof and must be removed prior driving in wet conditions.