Fangrui Product Details 30a Brushless Speed Controller Esc Multicopter Quad-rotor X-copter Specification: 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. Color: Multicolor Material: Plastic+metal Sg90 9g Micro-servo: This Is The Most Popular Mini Servo. Only Weighs 9 Gram And Gives You A 1.5 Kg/cm Torque. Pretty Strong Regarding Its Size. Suitable For Beam Type Robots. Key Features: Lucent Body Lightweight Less Noise Sg90a 9g Servo Parameters: Size: 21.5mmx11.8mmx22.7mm Weight: 9 Grams No Load Speed: 0.12 Sec / 60 Deg (4.8 V) Locked-rotor Torque: 1.5-1.7kg/cm (4.8v-6v) Operating Temperature: -30~~+60 Degrees Celsius Dead Zone Setting: 5 Micro