Hobbywing Pentium 18A Brushless Speed Controller ESC for Rc Heli Airplane, 2A UBEC for Rc Aircraft, Quadcopter, Multicopter Output: 18A Continuous, 22A Burst for 10 seconds Input Voltage: 5.6V - 16.8V (Lithium: 2S to 4S or NiMH/NiCd 5-12 Cells) BEC (Battery Elimination Circuit) Output: 2A Linear Mode BEC Max Speed: 210,000rpm for 2 Poles BLM; 70,000rpm for 6 poles BLM; 35,000rpm for 12 poles BLM. (BLM=BrushLess Motors) Size: 24mmx45mmx11mm (W x L x H)