?"Platinum-30A-OPTO-PRO" ESC is the best choice for multi-rotor aircraft.<br /><br /><strong>Specification</strong><br />High performance microprocessor， best compatibility with all kinds of motors， highest driving efficiency.<br />Optimized for multi-rotor aircraft.<br />Smooth， linear， quick and precise throttle response.<br />Multiple protection features: Low-voltage cut-off protection / Over-heat protection / Throttle signal loss protection.<br />The firmware of the ESC can be updated through the built-in USB adapter in the Professional LCD Program Box.<br />User programmable.<br />Multiple program methods supported: transmitter stick， Digital LED Program Card， Multifunction LCD Program Box， Professional LCD Program Box， PC software. Very easy to program the ESC at home or at the flying field.<br /><br /><strong>Features:</strong><br />Output: Continuous 30A， burst 40A up to 10 seconds.<br />nput Voltage: 2-6 cells lithium battery or 5-18 cells NiMH battery.<br />BEC: Not available.<br />Refresh rate of the throttle signal: 50Hz to 432Hz.<br />Max Speed: 210000rpm for 2 Poles BLM， 70000rpm for 6 poles BLM， 35000rpm for 12 poles BLM.(BLM = BrushLess Motor)<br />Size: 55mm (L) * 25mm (W) * 12mm (H).<br />Weight: 31g.<br />Package size: 15 * 15 * 2cm / 6 * 6 * 0.8in<br />Package weight: 51g / 1.8 oz<br /><br /><strong>Package list:</strong><br />1 * HOBBYWING Platinum Pro 30A ESC