Screen. It can be a regular screen or a touch screen. The touch screens are usually bigger and they often show the stats very clearly. The screen can be black and white or color. The color screens drain the battery much faster. There are devices without screens and they are great if you don’t want to get carried away with the statistics. All the information will be on your phone.
The look and the size. Fitness trackers are sold as bracelets for the wrist or the ankle. The ones for the ankle are better for runners. A classic fitness tracker for the wrist should be tried on before you buy it, to make sure it’s the right size.
Battery. Check the battery life of the device. Some trackers are very efficient and the batteries last for 2-3 weeks. Others kill the battery in several days and you have to charge them regularly.
Memory. Some bracelets can be used as players and you can listen to music if you connect them to your phone and upload the files into the memory. Buy a tracker with at least 4 GB of memory storage. That’s 300 songs.
Voice control. You can control the device with your voice when your hands are busy.

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