I haven't used anything else, but the intermediate frequency therapeutic instrument I used is not powered on, which is very safe. Is the preferred current frequency, safe and comfortable, will not be charged. I have been using Beyikang. Their products have triple protection facilities to ensure the absolute safety of current and can be used with great confidence. Their IF physiotherapy instruments strictly follow the national mandatory industry standards, and the dual isolation of IF instruments is safer. In the worst case, the equipment suddenly breaks down, but even in the worst case, it will not cause harm to the human body, at most, the safety tube is burnt out, which is just in case, and there is no side effect in clinic. Many hospitals are using their products to do rehabilitation physiotherapy for people. Very safe. You can rest assured.