This is Spektrum RC Firma 100 Amp Brushless Smart ESC and Motor Combo. This powerful brushless combo offers a 6500kV motor paired with a specifically tuned for 1/10 scale stock and pro 2S no prep drag racing 100 Amp ESC. Making it an excellent easy plug and race option for replacement, upgrading or starting a new build. Smart all in one telemetry. Powerful 32-bit ARM M4 processor. High RPM performance motor and ESC. Easy programming with multiple methods (Smart Transmitter/Smart programming box/Smartlink USB). Compact design to fit most applications. Ready to install with no soldering needed. High heat resistant IC5 connectors. Aluminum heat sink with a cooling fan for high efficiency. Multipoint protection (Over-current/Thermal/ Failsafe/LiPo low-voltage cutoff). Length: 1.7 (43mm). Outer Diameter: 1.41 (36mm). Weight: 4.9oz (136g). Maximum Burst Current: 650A. Maximum Continuous Current: 100A. Output Connector: 4mm bullets. BEC Continuous Current: 4A. BEC: Yes 6V-7.4V. Input Voltage: 2S-3S LiPo/ 5-9 Cell-NiMH. (1) Spektrum Firma 100Amp Brushless ESC. (1) Spektrum Firma 6500Kv motor. (1) Sticker sheet and mounting tape.