Castle Creations Mamba Monster ESC with 2200kv 5mm Combo Size: 2.2 x 1.9 x 1.4" (56 x 48 x 35mm), Weight: 4.3oz (121g) Cells: 18 NiCd/NiMH, 6 cell LiPo, Continuous: N/A, Resistance: .0003 Ohm Brake: Proportional with adjustable curve, Reversible: Yes, with lockout Low Voltage Cut-off: Programmable 4 pole, slotted, brushless motor wound 1 turn in a Y configuration