The BLhelis_S 35A ESC supports 2-6S batteries, boasts a continuous current of 35A and a transient current of 40A, and includes a built-in ammeter. Utilizes the mainstream STM32F411 flight controller for stable operation. Comprehensive expansion ports include support for buzzer and LED functions. A 25.5mmx25.5mm mounting hole allows for mounting on most commercially available racks. Product Name: GEP-F4-35A MCU: STM32F411 IMU: ICM42688-P (SPI) Flight Controller Firmware: GEPRC_F411_AIO OSD: Betaflight OSD with AT7456Ev Ports: R1 T1/R2 T2 Softport: R11 T11 Reverse Port: RT2 Buzzer: Yes LED: Yes USB Port: Micro-USB ESC MCU: BB21F16G Continuous Current: 35A Current: 40A (10S) Input: 2-6S (LiPo Battery) ESC Protocols: Dshot 300/600, Oneshot, Multishot Ammeter: 210 ESC Firmware: G_H_30 BLS Dimensions: 32x32mm Board Mounting holes: 25.5mm x 25.5mm, compatible with most commercially available racks (The product printed words depending on the batch, but this does not affect use) Color: Black Material: PCB Package Contents: 1 x AIO Flight Controller 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.