I wore this watch for 4 days and the battery life has increased from 75% to 55% which is amazing. Doesn't squeak, but vibrates frequently. You can change the type of vibration. The green light in the pictures is the heart rate monitor and the red light is the O2 monitor. It tracks your sleep and the results are consistent with my other expensive sleep watches. It automatically tracked my steps as I walked, but you can track additional stats manually. If you're looking for a relatively cheap activity tracker, the battery life alone is worth it.
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