New CGM - Medtrum S7 and Nemaura SugarBEAT

Hi all, had anyone tried these 2 new CGM before? Medtrum S7 and Nemaura
SugarBEAT. May i know:

  1. What is the accuracy of blood glucose reading?
  2. What is the reliability of the connection of sensor/transmitter to smartphone?
  3. How frequent do you have to calibrate against glucometer?