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  1. ZTW Spider Series For Raceing Drones ,Built in BLheli FirmWare The ZTW Spider series of ESCs are a great choice for any size of multi-rotor. Designed from the ground up for simple installation and easy setup and pre-flashed with SimonK OneShot 125 firmware to give a fast, super-smooth, linear throttle response which is ideal for multi-rotors. Alongside the superb build quality, ZTW Spider ESCs feature thermal overload protection and auto throttle shut down in case of signal loss. Features: • Developed specifically for multi-rotor use • Pre-flashed from the factory with SimonK firmware • 12V supply out for auxiliary equipment • Uses powerful, high performance MCU • Super-smooth and accurate throttle response • Auto throttle shut down in signal lose situation • Safety thermal over-load protection • Safe start, motor will not run until ESC is armed correctly • Low internal resistance • Programmable via throttle stick (see instructions under "Files" tab) Specs: Constant Current: 60A,50A,30A,20A, Max Burst Current: 70A Input Voltage: 7.4~22.2V (2~6S LiPoly) BEC: OPTO Output: 12V Dimensions: 55 x 30 x 13mm Weight: 50g Servo Lead: JR Type More info: http://www.ztwshop.com/product/ztw-spider-series-brushless-esc/ ZTW Agricultural Drones electronic speed control(ESC) for your Agricultural Drones More info: http://www.ztwshop.com/product/airplane-brushless-esc/Spider-Pro-esc/