Phone Comparison - Xiaomi Mi 4 vs Lenovo Vibe X2 vs Xiaomi Redmi Note 2
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| Manufacturer | Xiaomi | Lenovo | Xiaomi |
| Announced | July 2014 | September 2014 | August 2015 |
| Status | Available - Q3 2014 | Available - October 2014 | Available - August 2015 |
| Price | - | - | Rs. 9,700 ($141.99) [Similarly Priced] |
| Colors | Black, White | White, Gold, Red, Dark Grey | Black, White, Yellow, Mint Green, Blue |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
139.2 x 68.5 x 8.9 mm (5.48 x 2.7 x 0.35 in) |
140.2 x 68.6 x 7.3 mm (5.52 x 2.7 x 0.29 in) |
152 x 76 x 8.3 mm (5.98 x 2.99 x 0.33 in) |
| Weight | 149 g (5.26 oz) | 120 g (4.23 oz) | 160 g (5.64 oz) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1700 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100, TD-SCDMA |
| 4G Network | LTE | LTE 800 / 1800 / 2100 / 2600 | LTE band 1(2100), 3(1800), 7(2600), 38(2600), 39(1900), 40(2300), 41(2500) |
| Messaging | SMS, MMS, EMail, IM | SMS, MMS, EMail, IM | SMS, MMS, EMail, IM |
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| OS | Android OS, v4.4.3 (KitKat) | Android OS, v4.4 (KitKat) | Android OS, v5.0 (Lollipop) based MIUI 7 |
| Processor | Quad-core 2.5 GHz Krait 400, Qualcomm MSM8974AC Snapdragon 801 | Octa-core 2.0 GHz, MediatTek MT6595m True8Core | Octa-core 2.0 GHz Cortex-A53, Mediatek MT6795 |
| GPU | Adreno 330 | PowerVR G600 | PowerVR G6200 |
| RAM | 3 GB | 2 GB | 2 GB |
| Internal Memory | 16/64 GB | 32 GB | 16 GB |
| External Memory | No | No | Yes |
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| Type | IPS LCD capacitive touchscreen | IPS LCD capacitive touchscreen | IPS LCD capacitive touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.0 inches | 5.0 inches | 5.5 inches |
| Resolution | 1080 x 1920 pixels (441 ppi) | 1080 x 1920 pixels (441 ppi) | 1080 x 1920 pixels (401 ppi) |
| Screen-to-Body Ratio | 72.14% | 71.52% | 72.02% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio | - | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 13 MP, 4128 x 3096 pixels | 13 MP, 4160 x 3120 pixels | 13 MP, 4128 x 3096 pixels |
| Flash | Dual-LED Flash | LED flash | LED flash |
| Features | Auto focus, 1/3' Sensor Size, 1.12µm Pixel Size, Geo-tagging, Touch Focus, Face And Smile Detection, HDR | Auto focus, Geo-tagging, Touch Focus, Face Detection, Panorama, HDR | Phase Detection Auto focus (PDAF), Geo-tagging, Touch Focus, Face/smile Detection, HDR |
| Video | 2160p, 1080p@30fps, HDR | 1080p@30fps | 1080p@30fps |
| Front Camera | 8 MP, 1080p@30fps [Similar] | 5 MP [Similar] | 5 MP [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | DC-HSDPA, 42 Mbps; HSDPA, 21 Mbps; HSUPA, 5.76 Mbps; LTE | HSDPA, 42 Mbps; HSUPA; LTE, Cat4, 50 Mbps UL, 150 Mbps DL | TD-SCDMA |
| Bluetooth | v4.0, A2DP | v4.0, A2DP | v4.0, A2DP, LE |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n/ac, dual band, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| USB | microUSB v2.0 (MHL), USB On-the-go | microUSB v2.0 | microUSB v2.0, USB Host |
| GPS | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS |
| Browser | HTML5 | HTML5 | HTML5 |
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| Internal | 16/64 GB, 3 GB RAM | 32 GB, 2 GB RAM | 16 GB, 2 GB RAM |
| Expandable Storage | No | No | Yes |
| USB OTG | Supported | - | Supported |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| NFC | |
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| Type | Non-removable Li-Ion Battery | Non-removable Li-Po Battery | Li-Po Battery |
| Capacity | 3080 mAh | 2300 mAh | 3060 mAh |
| Stand by | - | Up to 228 h (2G) Up to 216 h (3G) |
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| Talk Time | - | Up to 17 h (2G) Up to 19 h (3G) |
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