12A:12A continuous current, 15A short-time current (less than 10 seconds)Power consumption: two lithium batteries or 5-6 NiMH/set of NiCd batteriesBEC output: 5V at 1A (linear controller mode-linear mode)Throttle signal frequency range (refresh rate): 50Hz-432Hz Max speed: 2-motor 210000 rpm, 6-motor 70,000 rpm, 12 motor 35,000 rpm Size: 38mm(length)*18mm(width)*6mm(H)Weight: 9g15A:Specifications:DC: 15A Peak Current(10s): 20ABEC: 5V 2ALipo: 2-3SWnet Weight: 14g20A:Model: Skywalker-20A Continuous Current: 20A Series Current(gt; 10s): 25A BEC Output: Linear BEC Output: 5V2A BEC Output Rate: 5 Servos (2S Lipo) / 4 Servos (3S Lipo) Battery: 2-3S (Lipo) / 5-9 Cells (NiMH) Net Weight: 19g Dimension (L x W x H): 42x25x8mm Cable Length: 25cm Package Size: 12.5*11*2.5cm 30A:DC Current: 30A Peak Current: 40A(10s)Voltage: 2-3S LixxBEC: YesBEC Output: 5V/2A Valve: BlackProgrammable: YesSize: 70*25*8mm (without cable length)Net Weight: 38g40A:Model: Skywalker-40A Continuous Line: 40A Series Stream (gt; 10s): 55A BEC Rate: Linear BEC Output: 5V2A BEC Output Rate: 5 Servos (2S Lipo) / 4 Servos (3S Lipo) Battery: 2-3S (Lipo) / 5-9 Cells (NiMH) Net Weight: 35g Dimension (L x W x H): 68x25x8mm50A:Continuous Output Power: 50A Series Weight: 60A at 10S Power Consumption: 2-4S Lixx/5-12S NixxBEC Output 5V/3A, Switching ModeRefresh Rate: 50Hz-432Hz Max. Rotation speed: 2-pole 210000 rpm/min; 6-Pole 70000 rpm/min; 12-post 35000