CJMCU-1292 ADS1292R ECG Respiratory Impedance ECG 2 Channel 24-bit A/D Converter
tqvm
seems to be an outright clone of this board: https://www.protocentral.com/analog-adc-boards/783-ads1292r-ecgrespiration-breakout-board.html problem with that is the license of the original (CC-BY-SA): that license states that you MUST give credit to the original creators, which was not done here... Legal issues incoming! Other than that it is a well-made board. Documentation available here: https://github.com/Protocentral/ADS1292rShield_Breakout
verry good