| | Performances/characteristics | Server | Sensor (fingerprint) | NFC card | Memory IC | SD card & NAND | RAM |
| | Capacity | Large | Average | Small | Small | Average | Average | | Speed of transferring data | Fast | Slow | Slow | Slow | Average | Fast | | Power consumption | High | Depend on types of sensors | Low | Low | Low | High | | Durability | High | High | High | High | High | Very high | | Cost | $150-$4000 | $18-$28 | $0.20-$1 | $1 to $3 | $10-$20 | $10-$50 | | Biometric modalities for attendance systems | Iris [76, 97]; voice [15, 100]; fingerprint [17, 18, 32, 35, 40, 42–44, 47, 48, 54, 58, 88, 115]; and face [29, 46, 62, 69, 70, 116] | Fingerprint [35, 42–44, 82] | Fingerprint [32] | Iris [76]; fingerprint [43, 54] | Fingerprint [38, 39, 48, 82] | Fingerprint [42, 75, 88] |
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