It is a 90A brushless ESC. The design is easy to maintain and has low interference The PCB adopts high-end composite material, which has stronger overcurrent capability and good heat dissipation.MOS adopts high current resistance mos, low energy consumption, and strong load capacity Using industrial grade , high temperature resistance. High-quality capacitors, strong filtering performance Intelligent control: The controller has a built-in low-noise button, which can be controlled remotely by one button Maximum power: The OSD allows you to control your drone with maximum speed and accuracy, while providing a smoother flight Item Type: BLS 90A 30.5x30.5 4-in-1 ESC MCU: EFM8BB21F16G MOSFET: High performance MOSFET Power Input: 3-6S LiPo Continuous Current: 90 * 4 Burst Current: 110A() ESC Telemetry: NO Current Sensor Scale:200 ESC Protocol: DSHOT300/600 Firmware: Q_H_40_24_v0.19.2 Mounting: 30.5 x 30.5mm( 4mm hole diameter) The product appearance and printed words depending on the batch, but this does not affect use. Color:Black Material:PCB Package Contents: 1 * BLS 90A 4-in-1 ESC 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.