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 |