<Tr> <Th> Connectivity </Th> <Td> Original, Series 1, and Series 2: Bluetooth 4.0 Series 3: Bluetooth 4.2 All models: NFC, Wi - Fi (802.11 b / g / n 2.4 GHz only) Diagnostics port </Td> </Tr> <Tr> <Th> Power </Th> <Td> <P> Built - in rechargeable Li - Po battery 38mm 3.8 V 0.78 W h (205 mA h) </P> 42mm 3.78 V 0.93 W h (246 mA h) </Td> </Tr> <P> Built - in rechargeable Li - Po battery 38mm 3.8 V 0.78 W h (205 mA h) </P> <Tr> <Th> </Th> <Td> <P> 38 mm 38.6 mm × 33.3 mm × 10.5 mm (1.52 in × 1.31 in × 0.41 in) </P> 42 mm 42 mm × 35.9 mm × 10.5 mm (1.65 in × 1.41 in × 0.41 in) </Td> </Tr>

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