Provide only context-relevant information
Information that is delivered on time is what makes wearable devices valuable. Applications may use device sensors to get context clues about what users are doing and provide helpful and relevant insights. For example, smart posture belts worn around a person's waist can register body movement and send users notifications to the respective app if they slouch.
Collaborating with built-in device sensors will help designers prevent being intrusive and help send only relevant alerts that provide information that matters. Additionally, your app can cooperate with device services like geolocation and use it to improve usability. For example, a smartwatch can use GPS to provide real-time navigation updates for runners, suggesting optimized routes based on their location and pace.

