Amazon is getting into the wearable tech market. Yesterday they unveiled their new fitness band called Halo. It can track your physical and emotional health, including your body fat and even your emotions. The Halo band does not have a screen like other smartwatches and instead delivers data to a phone app. The band has a small sensor that measures body temperature and heart rate, as well as microphones to measure the tone of a user’s voice to see if they sound stressed or energetic. The app can also measure intensity and duration of movement, instead of just counting steps. The Amazon Halo Band will be subscription based, costing $4/month.