PUTTING THE X IN EXTREME! The Mamba Micro X2 is a refresh of our popular Mamba Micro X. This new ESC increases the maximum input voltage to 4s (when used with 4s capable motors). We have also added DATA LOGGING and our CRYO-DRIVE TECHNOLOGY which allows the ESC to run cooler and more efficiently at partial throttle. Like its predecessor, it is waterproof and has sensored motor support. This ESC and Motor Combo is ideal for 1/14th and 1/16th scale vehicles, weighing up to 2.75lbs and up to 2s LiPo. The sensored 1007-8450kv motor allows for smooth startup with heaps of torque and low temperatures This Mamba Micro X2 does not contain an internal BEC, but your purchase includes a FREE Castle Creations external 10-amp CC BEC, a $24 value! This upgraded BEC has a wider range of BEC voltages and much higher current capacity. Features include input voltage range of 2S-4S, waterproof design, (included CC BEC is not waterproof), convenient transmitter programming for six common adjustable settings, additional settings and software updates available via Windows-based Castle Link software and USB adapter (coupon included with purchase) or the Castle Link App and a B-LINK Bluetooth Adapter (discount coupon included), telemetry ready (compatible with S.BUS2 Telemetry Link and Futaba T4PX, T7PX and T7PXR transmitters), auxiliary wire functionality allows for “on-the-fly” adjustments such as Max Power and Max Brake and audible alerts that will notify you of possible issues with calibrations and error conditions. Your purchase includes Mamba Micro X2 ESC with 4mm connectors, external 10-amp CC BEC, 1007-8450Kv sensored motor, sensor harness, coupon for free Castle Link USB adapter or discounted B-Link Bluetooth adapter, Quick Start Guide and Castle Decals. Battery Connector required for operation, we recommend Castle 4.0mm polarized connectors, Deans Ultra Plugs or XT60 connectors. The ESC measures 1.64” x 1.16” x 84”, motor measures 1.9” x 1.10”. Mounting hole specifications: M2.5 @ 14mm & 16mm; M3 @ 19mm.