| Ease of Setup | Time required to unpack, connect, and begin a session. | One-piece or clearly labeled modular design; operating instructions can be followed in under 5 minutes. | Unclear controls, missing connection diagrams, or dependence on a mobile app for basic operation. | 10% | — |
| Controls and Session Management | Readability of the display, control layout, timer accuracy, and ease of changing intensity or frequency. | Physical controls or a reliable interface, visible timer, saved settings, and clear intensity steps. | No session timer, confusing symbols, accidental setting changes, or inaccessible controls. | 10% | — |
| Foot Coverage and Fit | Usable treatment area, foot positioning, and compatibility with the intended user. | Both feet can remain comfortably positioned without excessive pressure; the product lists dimensions and user-size limits. | Small treatment surface, unstable foot placement, or no dimensional information. | 10% | — |
| Portability and Storage | Product weight, carrying method, cable storage, and storage footprint. | Integrated handle or compact form; cables can be stored safely without sharp bending. | Heavy or awkward construction, exposed connectors, or no practical storage solution. | 5% | — |
| Cleaning and Hygiene | Surface material, seam design, and manufacturer cleaning instructions. | Smooth, wipe-clean contact surfaces and clearly stated cleaning instructions; no absorbent fabric on the main foot-contact area. | Non-removable porous padding, unclear liquid restrictions, or difficult-to-reach seams. | 10% | — |
| Build Quality | Housing rigidity, connector strain relief, foot stability, and finish quality. | Stable base, reinforced cable exits, secure connectors, and no movement or rattling during normal use. | Loose housing, fragile hinges, unprotected cable joints, or excessive heat during normal operation. | 15% | — |
| Technical Transparency | Availability of waveform, frequency, intensity or magnetic-flux information, power requirements, and user documentation. | Specifications are stated in consistent units, operating limits are explained, and the manual is available before purchase. | Only vague phrases such as “maximum strength” or “professional power” without test conditions or measurable specifications. | 15% | — |
| Safety and Compliance | Electrical safety information, overheating protection, contraindications, and regulatory documentation relevant to the sales region. | Complete user warnings, automatic shutoff or thermal protection where applicable, traceable manufacturer information, and verifiable compliance documentation. | No contraindications, no electrical ratings, unsupported medical claims, or missing regulatory information. | 15% | — |
| Warranty and Service | Warranty duration, coverage, exclusions, return window, repair process, and replacement-part availability. | Written warranty terms, at least 12 months of coverage as a practical minimum, responsive support, and a clearly defined repair or replacement process. | Warranty applies only to selected parts, support is unreachable, shipping responsibilities are unclear, or terms are unavailable before purchase. | 10% | — |
| Overall Value | Total ownership cost compared with documented usability, construction, support, and expected service life. | Transparent purchase price, reasonable operating cost, useful warranty, and measurable features that match the intended use. | High price based mainly on marketing claims, unclear accessories, recurring subscription fees, or costly return shipping. | 10% | — |