Features: 1.Safe power function:regardless of the throttle stick in any position the motor will not start immediately. 2.Throttle Calibration function:Adapt to different remote throttle travel difference, improve throttle response linearity, with a smooth, delicate feel and excellent speed linear speed. 3.Low Voltage Protection Mode ,Low-voltage protection threshold. 30A Brushless speed controller ESC MultiCopter Quad-rotor X-copter Specifications: Compatible with: 400-450 helicopters / Aircraft or Quad-Rotor Multi RC Helicopter -Output: Continuous 30A, Burst 40A up to 10 Secs. -Input Voltage: 2-3cells lithium battery or 5-9 cells NiCd/NIMh battery. -BEC: 2A / 5V (Linear mode). -Max Speed: 210,000rpm for 2 Poles BLM, 70,000rpm for 6 poles BLM, 35,000rpm for 12 poles BLM. (BLM: BrushLess Motor) With T plug and 3.5mm banana connectors Note: This ESC is not able to flash the firmware. A2212 1000kv Motor Specification: KV: 1000 Max Efficiency: 80% Max Efficiency Current: 4-10A (>75%) Current Capacity: 12A/60s No Load Current @ 10V: 0.5A No. Of Cells: 2-3 Li-Poly Motor Dimensions: 27.5 x 30mm Shaft Diameter: 3.17mm Weight: 47g A2212 1400kv Motor Specifications: KV: 1400 Max Efficiency: 80% Max Efficiency Current: 4-10A (>75%) Current Capacity: 12A/60s No Load Current @ 10V: 0.5A No. Of Cells: 2-3 Li-Poly Motor Dimensions: 27.5 x 30mm Shaft Diameter: 3.17mm Weight: 47g A2212 2200KV Motor Specifications: KV: 2200 Ri(M ): 0.033 Battery: 2-3Li-Po Max Power: 342W Test Prop: 7x3/7x4 Motor Size: 27.5x38mm/1.08''x1.5'' Shaft Diameter: 3.17mm/0.12'' Package information: Package Size:25*15*3cm Package Weight:90g Package included: 1 x A2212 Motor 1 x 30A ESC