![Amazon.com: Fitbit Charge 4 Fitness and Activity Tracker with Built-in GPS, Heart Rate, Sleep & Swim Tracking, Black/Black, One Size (S &L Bands Included) : Sports & Outdoors Amazon.com: Fitbit Charge 4 Fitness and Activity Tracker with Built-in GPS, Heart Rate, Sleep & Swim Tracking, Black/Black, One Size (S &L Bands Included) : Sports & Outdoors](https://m.media-amazon.com/images/I/71smqRr0pmL._AC_UF1000,1000_QL80_.jpg)
Amazon.com: Fitbit Charge 4 Fitness and Activity Tracker with Built-in GPS, Heart Rate, Sleep & Swim Tracking, Black/Black, One Size (S &L Bands Included) : Sports & Outdoors
![Does your fitness band really work? Scientists analyse the tracking tech and find Fitbit and others 'no more effective than a pedometer' | Daily Mail Online Does your fitness band really work? Scientists analyse the tracking tech and find Fitbit and others 'no more effective than a pedometer' | Daily Mail Online](https://i.dailymail.co.uk/i/pix/2014/06/10/article-2653178-1E9E492400000578-557_634x617.jpg)
Does your fitness band really work? Scientists analyse the tracking tech and find Fitbit and others 'no more effective than a pedometer' | Daily Mail Online
![Smart watch Fitbit Versa 2 Review - how can a fitness tracker without GPS be that good? - NotebookCheck.net Reviews Smart watch Fitbit Versa 2 Review - how can a fitness tracker without GPS be that good? - NotebookCheck.net Reviews](https://www.notebookcheck.net/fileadmin/_processed_/5/3/csm_Fitbit_Versa_2_3QTR_SE_Smoke_Mist_Grey_Alexa_Voice_fc8d848dbd.jpg)