Do not buy if (read review)
SX Mini SL Class
If you work with configuration of curves or memory DO NOT BUY THIS.
Each time you take off batteries for recharge all customization is lost.
80% of the time when you connect to SXi app (in Windows 10) the device is not recognized.
Yihi NEVER answer to any email.
They have only one (expensive) mod that is OK: Yhi 550J based chip. Works very well and does not needs Yihi support, that does not exist.
FOR ME YIHI IS PASTED (although they have VERY GOOD mods ... till you have the first problem)