The little devices use Bluetooth, so the batteries last several years (replacement is easy as they use standard batteries), have a 50m range, are diminutive in stature (Height: 8,25 mm / Diameter: 28 mm) and will cost around $35.00 (£22.00). Go to Indiegogo to pre-order yours now, available March 2015.
Pre-order: Indiegogo
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