The popularity of wearable devices has seen an explosion of market entrants all vying to deliver a better user experience with a richer feature set than their competitors.

The challenge for product designers is to balance this growing feature set with form-factor limited battery lives. The Bluetooth Low Energy (BLE) wireless interface has dramatically cut power consumption for many applications, although its ubiquity has once again raised the stakes among developers by pushing them to reconsider a range of design trade-offs that can squeeze yet more operating life between re-charges.

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