TY - GEN SP - 2025 AV - public Y1 - 2017/05/06/ EP - 2033 TI - WRISTBAND.IO: Expanding Input and Output Spaces of a Smartwatch N1 - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions. UR - http://dx.doi.org/10.1145/3027063.3053132 PB - ACM publishing N2 - Smartwatches are characterized by their small size designed for wearability, discretion, and mobile interactions. Most of the interactivity, however, is limited to the size of the display, introducing issues such as screen occlusion and limited information density. We introduce Wristband.io, a smartwatch with an extended interaction space along the wristband, enabling (i) back-of-band interaction using a touchpad, (ii) a low resolution ambient watchband display for off-screen notification, and (iii) tangible buttons for quick, eyes-free input. Insights gained through a study show that back-of-band input increases accuracy and task completion rates for smaller on-screen targets. We probe the design space of Wristband.io with three applications. ID - discovery1555566 A1 - Saviot, L A1 - Brudy, F A1 - Houben, S KW - Smartwatch KW - Interaction Technique KW - Back-of-device interaction KW - Wristband.io CY - New York, NY, USA ER -