Overall great VTX's with tones off functions, really looks alike other similar products with SmartAudio protocol. The most pleasant thing is MMCX connector on 20x20 Vtx with mounting holes (also 600mw on such small vtx is great news too - add extra heat sink for better use, and at least airflow if you'r not flying)!

Will try FX3 on extra mini quads.

AKK FX2

Key features:

• Support Parameter-adjusting mode via SmartAudio
• 25mW, 200mW, 500mW and 800mW power switchable
• One button frequency and power setup
• OSD configuration using FC Uart
• 7-24V input with Build-in BEC 5V output @300mA
• With MIC!
• Only 7grams + 7gr MMCX Pigtail antenna
• Naked bottom (Flat)
• Size: 36mm x 36mm x 5mm (wlh)
• 6P JST connector

Button control Channel select mode:

• Channel select mode
• Band select mode
• Power select mode

Package included: 

• 1 x 5.8Ghz 40CH 25mW/200mW/500mW/800mW Switchable FPV Transmitter
• 1x Antenna and cable set
• 1x Product manual 

Specifications:  

Get from https://www.akktek.com/akk-fx2.html

AKK FX3

Get from https://www.akktek.com/akk-fx3.html