  Voice messages, by nature, prevent users from gauging the emotional tone
without fully diving into the audio content. This hinders the shared emotional
experience at the pre-retrieval stage. Research scarcely explored "Emotional
Teasers"-pre-retrieval cues offering a glimpse into an awaiting message's
emotional tone without disclosing its content. We introduce EmoWear, a
smartwatch voice messaging system enabling users to apply 30 animation teasers
on message bubbles to reflect emotions. EmoWear eases senders' choice by
prioritizing emotions based on semantic and acoustic processing. EmoWear was
evaluated in comparison with a mirroring system using color-coded message
bubbles as emotional cues (N=24). Results showed EmoWear significantly enhanced
emotional communication experience in both receiving and sending messages. The
animated teasers were considered intuitive and valued for diverse expressions.
Desirable interaction qualities and practical implications are distilled for
future design. We thereby contribute both a novel system and empirical
knowledge concerning emotional teasers for voice messaging.
