Probably the first F4 flight controller for brushed micro quads, the Eachine F4 supports 1S as well as 2S LiPo battery.

it's based on CC3D Revo F4 (uses same firmware target), supports Betaflight and Raceflight
http://www.banggood.com/Eachine-32bits-F...84264.html

Spec

• Dimension: 22mm*32.5mm
  
• Thickness: 1.2mm
  
• Weight: 4g
  
• support voltage: 1S and 2S
  
• voltage output: 3.3V and 5V
  
• ESC current rating (FET): 10A each motor
  
• Support SBUS/DSM/DSM2/DSMX Receiver
  

Receiver configuration


1. DSM/DSM2/DSMX receiver soldered directly to the DSM/DSM2/DSMX Receiver interface 3.3V, GND, RX3. Enable Seria_RX for UART3 and Set Receiver mode RX_SERIAL,   Select Spektrum1024(DSM/DSM2) or Spektrum2048(DSMX) in Raceflight configurator.
2. SBUS receiver welded to the UART1 GND, + 5V, RX1. Then Enable Seria_RX and Set Receiver mode RX_SERIAL , Select Sbus signal in Raceflight configurator.

It seems quite cheap for an F4 board. It's even cheaper than the F3 version.

why F4? because we can?