core 32-bit microprocessor for excellent performance. Up to 128KHz PWM drive frequency, dynamically adjustable according to RPM. high precision voltage comparator with accurate sampling against desync. Double-sided aluminum alloy armor for maximum protection. for BLHeli 32 firmware is the third generation of BLHeli firmware, following base BLHeli and BLHeli-S. All codes use damped light mode. Damped light does regenerative , causing very fast motor retardation, and inherently also causing active freewheeling. Supports regular 1-2ms pulse width input, as well as for Oneshot125 (125-250us), for Oneshot42 (41.7-83.3us) and for Multishot (5-25us). for Dshot signaling is supported at any rate up to at least Dshot1200. The input signal is automatically detected by the ESC upon power up, No need for throttle calibration. Supports beacon functionality, where the ESC start beeping after a given time of zero throttle. This can be very useful for finding a lost drone. EXTREME models only. (The product printed words depending on the batch, but this does not affect use) Color: As Shown Material: PCB Package Contents: 1 x ESC Stack 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.