Designing a heart-shaped screen pendant that feels like a charm, not a gadget

The newest wave of collectible gadgets looks like jewellery and behaves like a tiny device: a heart-shaped clear shell, a mini screen showing pixel faces and fortune tiles, a lanyard, USB-C charging. Sold in blister packs at impulse price points, they turn a “digital luck” experience into something you clip to a bag.

The shell does more than look cute

A transparent housing is a manufacturing choice, not just a style. It lets the PCB colours and screen bezel become part of the visual identity, and it hides nothing that needs hiding — which is why the internal layout has to be designed for display: battery placed off-centre to balance the lanyard, antenna kept away from the metal ring, speaker and charge port aligned so they read cleanly through the plastic.

Clear polystyrene or PC also scratches. A hard-coated or textured inner surface keeps the shell readable after a month in a bag with keys.

Two-tone screens force better art direction

A small two-tone panel cannot render gradients, so the content pipeline matters more than the panel spec. Expression tiles, fortune cards and short animations are drawn as 1-bit or 2-bit art with strong silhouettes. Teams that start from full-colour art and “downgrade” it produce mud; teams that design in the panel’s native constraint produce icons people screenshot and share.

Power and charging are the invisible features

A pendant is worn, so charging has to be as casual as wearing it: USB-C on the shell edge, a charge indicator readable in one glance, and enough capacity for days of idle expression changes rather than hours of video. Idle draw dominates — the screen content changes a few times an hour at most, so the power budget is mostly about sleep current, not display power.

What we look at when a client brings us this category

Shell clarity and coating, screen size versus heart proportion, lanyard anchor strength, charge port sealing, tile art pipeline, and blister packaging that survives retail. None of these is hard alone; the charm comes from getting all of them to agree at the same price point.