Product Review (submitted on July 5, 2021):
This TANDEM-transmitter is one of the best value you can get: very functional and excellent, everything is perfectly arranged, perfect design, highest technology power in a tiny case. The color touch screen display is excellent. The new ETHOS operating system works very good.
I switched from the TANDEM X20 transmitter to the TANDEM X20S, because this one has a built-in Audio Wireless Module (Compatible with Bluetooth Audio Device) and better High-Precision Hall-Sensor Gimbals (10 Ball-Bearings, adjustable 45° travel and 8° rotatable for gimbal dial).
I am therefore very satisfied with my new TANDEM X20S.