Apple Watch Series 2 Sport 42mm vs Celkon A21
Apple Watch Series 2 Sport 42mm
Celkon A21
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Network
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2G networkN/AGSM 900, 1800
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3G network-HSDPA 2100
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HSDPA speed-HSDPA
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GPRSNoYes
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EDGENoYes
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Availability
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Oficially announced2016-92014-12
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Status-2014-12
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Design
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BuildAluminum/Ceramic back-
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SIMNoDual SIM (dual stand-by)
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Height42.5 mm124.8 mm
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Width36.4 mm66.1 mm
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Thickness11.4 mm10.8 mm
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Weight34.2 g115.3 g
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Waterproof50m-
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ColorsCase colors: silver, gold, rose gold, gray; Band colors: gray, white, blue, brown, orange, black; Band types: sport, woven nylonBlack, Blue, Red
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Display
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Display typeAMOLED capacitive touchscreenCapacitive touchscreen
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Physical size1.65 inches4.0 inches
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Resolution390 x 312 pixels320 x 480 pixels
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Pixel density303 ppi144 ppi
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Display colors16777216-
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ProtectionIon-X strengthened glass-
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MultitouchYes-
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Hardware
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CPUDual-coreDual-core 1.2 GHz
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ChipsetApple S2Mediatek MT6582
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Memory ROM-512 MB
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Memory RAM-256 MB
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Memory cardNomicroSD
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Memory card max-32 GB
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OS
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OSwatchOS 3.0Android OS, v4.2.2 (Jelly Bean)
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Sound
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3.5mm jackNoYes
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LoudspeakerYesYes
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NotificationsVibration; RingtonesVibration, Polyphonic, MP3 ringtones
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Multimedia
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RadioNo-
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Radio FM-FM radio
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Connectivity
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WLANWi-Fi 802.11b, 802.11g, 802.11nWi-Fi
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USBYes
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Bluetoothv4.0v4.0
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Bluetooth A2DPYes-
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NFCYes-
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GPSYesNo
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Features
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Messaging SMSSMS(threaded view)SMS(threaded view)
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Messaging MMS-MMS
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Messaging EmailEmailEmail
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Messaging IMIM-
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Messaging Push MailPush Mail-
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JavaNoYes, via Java MIDP emulator
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SensorsAccelerometer, gyro, heart rate-
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Browser
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HTML-Yes
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BrowserNo-
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Battery
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Battery typeLi-IonLi-Ion
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Battery capacity-1500 mAh
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Battery removableNon-removable-
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Talk time 3G-8 h
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Standby time 3G-120 h
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Main camera
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Main camera3.15 MP
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Primary camera video-video
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Selfie camera
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Selfie camera1.3 MP
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