Specification: Brand Name: DYS Item Name: XS20A solder version BEC: NO Weight: 4.49g Input Voltage: 3-4s Lipo MCU: Silabs EFM8BB2 Size(mm)L*W*H: 24*14*4.5mm Firmware: BLHeli Bootloader & BLHeli_S Feature: High-current burst rating High-Resolution Throttle steps BLHeli_S does Damped Light only Utilizes high-performance EFM8BB2 50MHz MCU Supports 1-2ms signal, Oneshot125, Oneshot42 and Multishot Firmware upgradable via signal wire (works with USB Linker for XM series) Supports Motors with super high KV (EFM8BusyBee 50MHz can handle up to 500k eRPM) BLHeli_S ESC with Hardware generated PWM synchronous to MCU yields ultra-quiet motor performance