This is a Spektrum SPMXSEMC08 Firma Sensored 1/10th Crawler Power System with Firma Smart Sensored ESC and 2100kV Brushless Motor. The Spektrum Firma Sensored ESC System is a Combo that includes a Sensored 2100kv Motor and the Firma 60 Amp Sensored ESC, providing a perfect upgrade for 10th Scale Rock Crawlers and Scalers.