<Table> Apple Watch <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Td_colspan="2"> An Apple Watch with white Sport Band </Td> </Tr> <Tr> <Th> Developer </Th> <Td> Apple Inc . </Td> </Tr> <Tr> <Th> Manufacturer </Th> <Td> Quanta Computer (contract manufacturer) </Td> </Tr> <Tr> <Th> Type </Th> <Td> Smartwatch </Td> </Tr> <Tr> <Th> Generation </Th> <Td> 2nd Generation (from predecessor) </Td> </Tr> <Tr> <Th> Release date </Th> <Td> Original: April 24, 2015; 3 years ago (2015 - 04 - 24) Series 1 and Series 2: September 16, 2016; 22 months ago (2016 - 09 - 16) Series 3: September 22, 2017; 11 months ago (2017 - 09 - 22) </Td> </Tr> <Tr> <Th> Discontinued </Th> <Td> <P> Original: Replaced with series 1 and Series 2 Series 2: Replaced with Series 3 </P> Series 1 and Series 3: In production </Td> </Tr> <Tr> <Th> Units sold </Th> <Td> 33 million </Td> </Tr> <Tr> <Th> Operating system </Th> <Td> <P> Custom, marketed as watchOS, formerly Watch OS iOS versions based on: 1.0: iOS 8.2 1.0. 1: iOS 8.3 2. x: iOS 9 3. x: iOS 10 4. x: iOS 11 (Limited support on original) </P> 5. x: iOS 12 (Does not support original) </Td> </Tr> <Tr> <Th> System - on - chip used </Th> <Td> Apple Watch Original: Apple S1 (32 - bit ARMv7) Apple Watch Series 1: Apple S1P Apple Watch Series 2: Apple S2 Apple Watch Series 3: Apple S3 </Td> </Tr> <Tr> <Th> Memory </Th> <Td> Original, Series 1, and Series 2: 512 MB DRAM Series 3: 768 MB DRAM </Td> </Tr> <Tr> <Th> Storage </Th> <Td> Original, Series 1, and Series 2: 8 GB Series 3: 8 or 16 GB </Td> </Tr> <Tr> <Th> Display </Th> <Td> <P> OLED 38mm 33.96 mm (1.337 in) diagonal, 272 × 340 pixels, 326 dpi 42mm 38.96 mm (1.534 in) diagonal, 312 × 390 pixels, 326 dpi </P> Strengthened Ion - X glass or Sapphire glass </Td> </Tr> <Tr> <Th> Graphics </Th> <Td> PowerVR SGX543 </Td> </Tr> <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> <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> <Tr> <Th> Backward compatibility </Th> <Td> <P> watchOS 1, 2, and 3: iPhone 5 or later watchOS 4: iPhone 5s or later </P> Series 3 (GPS + Celluar): iPhone 6 or later </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.apple.com/watch </Td> </Tr> </Table> <Tr> <Td_colspan="2"> An Apple Watch with white Sport Band </Td> </Tr>

When was the series 1 apple watch released
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