The watch offers visual, audible, and haptic feedback. Whatever type of feedback is being used, it should clearly communicate the result of the user’s input. You can combine more than one type of feedback when you need to emphasize user input.
Haptic feedback deliver responses to users using vibration so they do not have to look at the screen. You can vary the duration and number of vibrations to communicate different meanings.
Duration of vibrations
Users often find extended vibrations annoying. In addition, long vibrations drain battery power.
Vibration can be created with different intensities. Because the watch is worn on the wrist, several factors can affect range of detectable vibration, including if users are moving, if they are wearing the watch, or how much they are focusing on the device. Haptic feedback should be provided selectively to avoid annoying users with unnecessary frequent feedback.
Feedback on text input
Because users generally type to perform a task, they need quick feedback on whether or not they are typing correctly. Consider ways to minimize latency to ensure instantaneous feedback when typing. Haptic feedback should be as brief as possible, within the range that users can notice the vibration (for example, less than 30ms).
Visual feedback inform users of a current state. Provide visual feedback to inform users that they have reached the end of a scrollable page or that a button or icon has been pressed. Refer to Visual design for more details.
Overscrolling effects indicate that the user has reached the end of a scrollable list or page. It appears as a straight line, at the edge of both a linear and circular page.
Button press effects indicate that a button or icon has been pressed by adjusting the color opacity or size of the button.
Adjusting the color opacity
You can adjust the color opacity of a button by 40% to indicate that the button has been pressed.
Adjusting the size
You can adjust the size of a button to indicate that the button has been pressed.
Audible feedback are sounds that are responses to a user’s action. Audible feedback helps ensure users to acknowledge the result of their interactions and reinforces user’s sensible and aesthetic experience. Consider the following elements when designing sounds and providing them as audible feedbacks.
A watch offers four audio stream types :ringtone, notification (message), media, and system. The audible feedback usually uses the system stream type whose volume can be adjusted by the system volume control. However, audible feedback can be designed differently, as needed.
Pitch and Volume
Make sure that a sound has the appropriate frequency range and volume for the target device. And, check how suitable the volume of the sound is by testing it at the default (9), minimum (1), and maximum (15) volume level.
Refer to the following table for the default volume of each stream type.
Sound and vibration
Consider designing sound and vibration feedback to have consistent meanings in the same functions.