Adopting CPU AT32F403ARCT7 with the structure of ARM - allows CPU clock speed. 240MHz and the max PWM switching frequency 45KHz, which improves the motor RPM. Programmable via ESC Tool to be compatible with multi-types of motor, different batteries voltages and many control ways. Programmable via VX4 remote (Firmware Version:VX4_V1.2.1or above) Supporting FOC with low working noise and smooth starting. Supporting Real-time data and fault alerts. Supporting adaptive variable PWM frequency control. Supporting sensor mode(HALL) and sensorless modes (IPDS, HFPI). Supporting control types: Current, Duty Cycle. Protection functions: low and high voltage protection, motor over-temperature protection (suitable for -10K-25 temperature sensing resistance only), battery over discharge protecting, mosfets over current and over-temperature protection. Firmware:V1.3 or above (firmware update via for ESC Tool supported) Voltage:14V-84V (safe for 4S-20S) Continuous current:50V/550A; 75V/450A (Values depend on the mounting, ambient temperature and air/water circulation around the device!) Current:1000A BEC:5V@1A Motor/power Wire Size:8 AWG (3pcs combine) Programmable Tool:for ESC TOOL PWM Frequency Control:YES Multiple Speed Gear Limit Control:YES (UART / ADC) Regenerative Capacity:Yes Communication Ports:USB, CAN, UART, PPM, ADC Input Signal Support:PPM, ADC, UART (compatible with remote VX4 and VX3Pro only at present, it will be compatible with more remote controllers soon) Startup Modes Support:IPDS (sensorless), HFPI (sensorless), HALL (sensored) Multiple Speed Gear levels:Low, Medium, High, Reverse Switch Support:Power on/off button switch or key switch Colour:Black Material:Metal Size:L 227.5 x W 140 x H 54mm(with water cooling enclosure) Package Contents: 1 * FT85RS ESC 550A Water Cooling ESC kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.