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Description
SpeedyBee F405 Mini BLS 35A 20x20 Stack$59. 99 for a Bluetooth 35A Stack? Thats ridiculous! Utilizing an upgraded F405 flight controller chip with better performance than the F411, it features a built in Bluetooth chip for seamless wireless Betaflight tuning. The board comes with a 4 level battery voltage display, built in barometer, and supports connectivity to all DJI Air Units. It offers 4 available UART ports, and a dual BEC setup with 5V 2A and 9V 3A outputs. 35A 4 in 1 BLHeliS Mini
Specs Overview
| Product Name | SpeedyBee F405 Mini BLS 35A 20x20 Stack |
| Flight Controller | SpeedyBee F405 Mini |
| ESC | SpeedyBee BLS 35A Mini V2 4-in-1 ESC |
| Bluetooth | Supported. Used to connect with the SpeedyBee App for flight controller and ESC parameter configuration. Please make sure the MSP switch on UART 4 is turned on and set to a baud rate of 115200, otherwise Bluetooth functionality will not be available. |
| WiFi | NOT Supported |
| Wireless FC Firmware Flashing | NOT Supported |
| Wireless Blackbox Dwonload & Analysis | NOT Supported |
| Power Input | 3-6S LiPo |
| Mounting | 20 x 20mm 3.5mm hole size，Compatible with M2 and M3 screws/Silicone grommets |
| Dimension | 32mm(L) x 35mm(W) x 14.2mm(H) |
| Weight | 13.5g |
Specifications
| ProductName | SpeedyBee F405 Mini Flight Controller |
| MCU | STM32F405 |
| IMU(Gyro) | ICM42688P |
| USB Port Type | Type-C |
| Barometer | Built-in |
| OSD Chip | AT7456E chip |
| BLE Bluetooth | Supported. Used to connect with the SpeedyBee App for flight controller and ESC parameter configuration. Please make sure the MSP switch on UART 4 is turned on and set to a baud rate of 115200, otherwise Bluetooth functionality will not be available. |
| Wireless FC Firmware Flashing | NOT Supported. Please connect to the Betaflight configurator on the PC to do FC firmeare update |
| Wireless Blackbox Dwonload & Analysis | NOT Supported. Please connect to the Betaflight configurator on the PC to do blackbox analysis. |
| WIFI | Not supported |
| DJI Air Unit Connection Way | Direct soldering |
| DJI Air Unit Compatibility | Compatible with all DJI Air Units: DJI O3/RunCam Link/Caddx Vista/DJI Air Unit V1. Please use the solder pads < 9V, G, T1, R1, G, SUBS(R2) > on the front right corner of the flight controller to make a pin-to-pin connection with the solder pads on the DJI Air Unit. UART1(T1, R1) is used for OSD and SUBS(R2) is used for DJI Air Unit’s internal SBUS receiver signal input. |
| Blackbox | 8MB Onboard Flash |
| BetaFlight Camera Control Pad | Yes(CC pad on the front side) |
| Current Sensor Input | Supported. For SpeedyBee BLS 35A V2 ESC, please set Scale=250 and Offset=-500. |
| Power Input | 3-6S LiPo. The flight controller is powered through the G, V wires of the 8pin harness or G, V pads from the bottom side of the flight controller. |
| 5V Output | 4 groups of 5V output, three +5V pads and 1 BZ+ pad( used for Buzzer) on front side. The total current load is 2A. |
| 9V Output | 1 group of 9V output, one +9V pad on front side. The total current load is 3A. |
| 3.3V Output | Supported. Soldering pad named ‘3V3’ on the front top of the flight controller. Designed for 3.3V input receivers. Up to 500mA current load. |
| 4.5V Output | Supported. Designed for radio receiver and GPS module even when the FC is powered through the USB port. Up to 1A current load. |
| ESC Signal | M1 - M4 wires or soldering pads on bottom side. |
| UART | 6 sets(UART1, UART2, UART3, UART4(Dedicated for Bluetooth connection)), UART5(Dedicated for ESC telemetry),UART6 |
| ESC Telemetry | UART R5(UART5) |
| I2C | Supported. DA & CL pads on front side. Used for magnetometer, sonar, etc |
| Traditional Betaflight LED Pad | Supported. 5V, G and LED pads on bottom of the front side. Used for WS2812 LEDs controlled by the Betaflight firmware. |
| Buzzer | BZ+ and BZ- pad used for 5V Buzzer |
| BOOT Button | Supported. Press and hold BOOT button and power the FC on at the same time will force the FC to enter DFU mode, this is for firmware flashing when the FC gets bricked. |
| RSSI Input | Not Supported |
| Smart Port / F.Port | Not Supported |
| Supported Flight Controller Firmware | BetaFlight(Default), INAV |
| Firmware Target Name | SPEEDYBEEF405MINI |
| Mounting | 20 x 20mm 3.5mm hole diameter ，Compatible with M2 and M3 screws/Silicone grommets. |
| Dimension | 30(L) x 32(W) x 7.8(H)mm |
| Weight | 9.6g |
| ProductName | SpeedyBee 35A BLHeli_S Mini V2 4-in-1 ESC |
| Firmware | BLHeli_S J-H-40 |
| Continuous Current | 35A * 4 |
| Burst Current | 45A(5seconds) |
| ESC Protocol | DSHOT300/600 |
| Power Input | 3-6S LiPo |
| Power Output | VBAT(Battery voltage, used to power the flight controller) |
| Current Sensor | Support (Scale=250 Offset=-500) |
| ESC Telemetry | Not supported |
| Mounting | 20 x 20mm ∅3.5mm hole size，compatible with M2 and M3 screws/Silicone grommets. |
| Dimension | 35 * 35 * 5.5mm |
| Weight | 7.2g |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 471 reviews
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Product Reviews
★★★★★ 3
Not well made
I have used these for 2 weeks now and one of them has a hole in the sole...
I won't ever buy them again
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 15, 2025
★★★★★ 5
Absolute game changer for chronically dry feet/cracked heels
Size: S (up to size 7)-Beige
I had recently bought a pair of silicone heel/ankle wraps to fill out my boot a little since I noticed my heels were lifting when I was skating. I tested them out around the house and noticed they left my heels softer while the rest of my sockless feet got quite dry. So I got these full foot silicone socks to see the effect of having my whole foot covered. I slather the entirety of my feet with Dr. Scholl's Severe Cracked Heel Restoring Balm (love how convenient it is to apply it to my feet with the solid stick form) and then slip them into these silicone socks. After just a couple hours, when I pull out my feet they're (a teeny bit sweaty at first), but then overall soft and smooth and have absorbed the balm fully leaving barely any residue in the silicone sock. I find these silicone socks generally comfortable; I wear them in the evenings while relaxing on the couch, take them off after a couple hours and let my feet breathe a bit, and then reapply my balm and socks and wear them to bed. If I wake up in the middle of the night, which I almost always do (not because of the socks), I'll take the socks off and allow my feet to breathe again. I wear a woman's size 6 shoe and the small size is pretty comfortable. However, I made the mistake of wearing them while being on my feet for a couple hours straight during household chores -- they must've somehow cut off my circulation a bit with the standing, so I wouldn't recommend wearing these silicone socks while being active. And since they're not exactly my foot size, they slide around sometimes and will start to feel tight at my big toe. But if that happens, I just tug on the toe area of the sock to give my big toe more wiggle room and problem solved. Prior to wearing these socks, I was soaking and doing heavy duty exfoliation of my feet every week. These socks seem like they'll work to help me extend the time between soakings and exfoliations. The 5 pack is a great value. So far none have torn, so they seem rather durable. Not sure what I could even do to tear a hole in these.
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Reviewed in the United States on January 16, 2026
★★★★★ 5
Works wonders
Size: M (up to size 9)-Beige
Works wonders for dry feet, like really dry, hard feet.
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Reviewed in the United States on February 23, 2026
★★★★★ 4
EXCELLENT FEET MOISTURE PROTECTION
Size: S (up to size 7)-Beige, Size: S (up to size 7)-Beige
Why did you pick this product vs others?:
I have burns on my feet and needed something that I could put burn creme on and still walk around in with. I tried other silicone footsie but they would teae really easily. So far these are doing really well for this purpose. They are holding their shape too. The only caution I have is the same with all silicone footsies: They can be slippery on wet floors, so also wear with socks over them.
The biggest issues is when they say a size they mean it. The silicone used in these have little give in them, so they won't stretch out and loose their shape. That can be a good thing, or not so good, depending on how well they fit your feet and what your intent is with wearing these. The other issue is if they fit snug around those toes, that tends to be where the first tear in the material will happen. Because of how these are made, the tear is actually more like cracking in the material and once it occurs you won't be able to get much use out of the sock after that. If you are planning to wear them around the house or for long term use, I suggest going up a size or look for the toeless options.
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Reviewed in the United States on July 5, 2025
★★★★★ 3
Silicone socks
Size: M (up to size 9)-Beige
The socks are sized large. The quality of the silicone is good. But they slide around on your feet if you try to walk, making them difficult to use and a bit uncomfortable. Unless you are able to sit for long periods of time the likely will not work well. Recommend looking for a better value.
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Reviewed in the United States on October 27, 2024