A filter for electrical devices with batteries, whether you can charge them via USB -C, Micro, Proprietary etc. would be great.
Especially usb C would be important to me because then you only need one charger and no power strip with X power supply units that block each other in the strip.
In my opinion, it is completely dubious to market EMS devices for the purpose of fat burning. The body only breaks down fat under a calorie deficit, which these devices are simply not capable of causing.
Targeted fat burning (e.g. on the abdomen, as one might think with an EMS abdominal belt) is not possible in principle, regardless of the training method.