Table 1.
Description of Fitbi Zip and ActiGraph GT3x-BT
| Fitbit Zip | ActiGraph GT3x | |
|---|---|---|
| Internal sensor | 3 axis accelerometer | 3 axis accelerometer + ambient light sensor |
| Output | Number of steps Minutes of fairly active, very active, light, sedentary |
Number of steps Minutes of vigorous, moderate, light, sedentary |
| Communication | Bluetooth | USB, Bluetooth |
| Memory size | 7 days of detailed motion data | 4 GB |
| Battery | Replaceable | Rechargeable |
| Battery life | Up to 6 months | 25 days |
| Size | 2.8 × 1.0 × 3.6 cm | 4.6 × 3.3 × 1.5 cm |
| Weight | 8 g | 19 g |
| Attachment site | Hip | Hip, wrist, ankle, thigh |
| Display screen | Yes | No |
| Cost | Approx. 60 EUR | Approx. 250 EUR |