| | Hardware | Processing | Interaction |
| | Size (volume) [7, 13, 28, 30–35] | Latency [12, 13] | Skin irritation [8] |
| | Weight [7–9, 12, 13, 28, 30, 31, 33–35] | Processing power and computational cost [16, 30, 32] | Comfort, thermal aspects, heat dissipation [8–13, 30, 31, 33] |
| | Electrical resistance [8, 30] | Security and privacy [8, 30, 31] | User Interface [11, 30–32] |
| | Stiffness and flexural endurance [8, 30] | Communication channels, networking [7, 8, 13, 30, 31, 34] | Weather [11, 30] |
| | Fluid repellency [28, 40] | Storage capacity and memory [7, 10] | Need for survival and medical prescriptions [30, 41–43] |
| | Magnetic shielding and radiation concerns [8, 13, 28, 30] | Dynamic voltage scaling techniques and power modes [16, 30] | Aesthetics and form language [9, 12, 13, 30, 33, 35] |
| | Stretchability [8, 30] | Sensor resolution [13, 30] | |
| | Skin contact quality body fit [9, 11, 13, 28, 30, 31, 33, 35, 38] | Sensitivity to changes in R-S interval [30, 39] | |
| | Sensor location and body placement [12, 30, 33, 38] | Correlation and mutual information with reference signals [13, 28, 30] | |
| | Sensor rotation [30] | Sampling rate/sampling frequency [16, 30] | |
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