Product
Oppo K9x
Oppo K9x
Apple iPhone 4s
Apple iPhone 4s
Battery
Charging 33W wired, 50% in 27 min Reverse wired -
Stand-by - Up to 200 h (3G)
Talk time - Up to 8 h (3G)
Type Li-Po 5000 mAh Li-Po 1432 mAh, non-removable (5.3 Wh)
Body
Build - Glass front (Corning-made glass), glass back, stainless steel frame
Dimensions 162.2 x 74.8 x 8.8 mm (6.39 x 2.94 x 0.35 in) 115.2 x 58.6 x 9.3 mm (4.54 x 2.31 x 0.37 in)
SIM Nano-SIM + Nano-SIM Micro-SIM
Weight 194 g (6.84 oz) 140 g (4.94 oz)
  - Scratch-resistant glass back panel
Comms
Bluetooth 5.1, A2DP, LE, aptX 4.0, A2DP, LE
NFC No -
Positioning GPS, GLONASS, GALILEO, BDS GPS, A-GPS, GLONASS
Radio No No
USB USB Type-C 2.0, OTG 2.0
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct Wi-Fi 802.11 b/g/n, hotspot
Display
Protection Aluminosilicate glass Corning Gorilla Glass, oleophobic coating
Resolution 1080 x 2400 pixels, 20:9 ratio (~405 ppi density) 640 x 960 pixels, 3:2 ratio (~330 ppi density)
Size 6.49 inches, 102.2 cm2 (~84.2% screen-to-body ratio) 3.5 inches, 36.5 cm2 (~54.0% screen-to-body ratio)
Type IPS LCD, 90Hz, 480 nits (typ), 600 nits (HBM) IPS LCD
Features
Sensors Fingerprint (side-mounted), accelerometer, gyro, proximity, compass Accelerometer, gyro, proximity, compass
Launch
Announced 2021, December 23 2011, October 04. Released 2011, October 14
Status Available. Released 2021, December 27 Discontinued
Main Camera
Features LED flash, HDR, panorama LED flash, panorama, HDR
Single - 8 MP, f/2.4, 35mm (standard), 1/3.2", 1.4µm, AF
Triple 64 MP, f/1.7, 26mm (wide), 1/1.97”, 0.7µm, PDAF 2 MP, f/2.4, (macro) 2 MP, f/2.4, (depth) -
Video 1080p@30fps, gyro-EIS 1080p@30fps
Memory
Card slot microSDXC No
Internal 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM, 256GB 12GB RAM 8GB 512MB RAM, 16GB 512MB RAM, 32GB 512MB RAM, 64GB 512MB RAM
  UFS 2.2 -
Misc
Colors Black, Blue Black, White
Models PGCM10 A1431, A1387, iPhone4,1
SAR - 1.18 W/kg (head)     0.98 W/kg (body)    
SAR EU - 0.99 W/kg (head)     0.99 W/kg (body)    
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 800 / 850 / 900 / 1700(AWS) / 1900 / 2100 HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 2, 3, 5, 7, 8, 28, 34, 38, 39, 40, 41 -
5G bands 1, 28, 41, 77, 78 SA/NSA -
Speed HSPA, LTE, 5G HSPA 14.4/5.76 Mbps
Technology GSM / CDMA / HSPA / CDMA2000 / LTE / 5G GSM / CDMA / HSPA / EVDO
  CDMA2000 1x CDMA2000 1xEV-DO
Platform
Chipset Mediatek Dimensity 810 (6 nm) Apple A5 (45 nm)
CPU Octa-core (2x2.4 GHz Cortex-A76 & 6x2.0 GHz Cortex-A55) Dual-core 1.0 GHz Cortex-A9
GPU Mali-G57 MC2 PowerVR SGX543MP2
OS Android 11, ColorOS 11.1 iOS 5, upgradable to iOS 9.3.6
Selfie camera
Single 16 MP, f/2.0, 26mm (wide), 1/3.0”, 1.0µm VGA, videocalling over Wi-Fi and 3G
Video 1080p@30fps 480p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes
Tests
Audio quality - Noise -91.2dB / Crosstalk -93.0dB
Battery (old) - Endurance rating 45h
Camera - Photo / Video
Display - Contrast ratio: 1261:1 (nominal) / 2.269:1 (sunlight)
Loudspeaker - Voice 65dB / Noise 64dB / Ring 74dB