Phone Comparison - Asus VivoTab RT vs Asus Zenfone 4 vs Lenovo S939
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| Manufacturer | Asus | Asus | Lenovo |
| Announced | October 2012 | January 2014 | February 2014 |
| Status | Available - November 2012 | Available - June 2014 | Available - February 2014 |
| Colors | Black | Black, White, Red, Blue, Yellow | Black, White |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
262.5 x 170.9 x 8.3 mm (10.33 x 6.73 x 0.33 in) |
124.4 x 61.4 x 6.3-11.2 (4.9 x 2.42 x 0.25-0.44) |
170 x 86.5 x 8.65 mm (6.69 x 3.41 x 0.34 in) |
| Weight | 525 g (18.52 oz) | 115 g (4.06 oz) | 180 g (6.35 oz) |
| 2G Network | N/A | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | - | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 2100 |
| 4G Network | - | - | - |
| Messaging | , Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM | SMS, MMS, Push Mail, EMail, IM |
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| OS | Microsoft Windows RT | Android OS, v4.3 (Jelly Bean), upgradable to v4.4.2 (KitKat) | Android OS, v4.2.2 (Jelly Bean) |
| Processor | Quad-core 1.3 GHz Cortex-A9, Nvidia Tegra 3 T30 | Dual-core 1.2 GHz, Intel Atom Z2520 | Octa-core 1.7 GHz, Mediatek MT6592 |
| GPU | ULP GeForce | PowerVR SGX544MP2 | Mali-450MP4 |
| RAM | 2 GB | 1 GB | 1 GB |
| Internal Memory | 32/64 GB storage | 8 GB | 8 GB ROM |
| External Memory | microSD, up to 64 GB | microSD, up to 64 GB | microSD, up to 32 GB |
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| Type | Super IPS+ LCD capacitive touchscreen | LCD Capacitive Touchscreen, Corning Gorilla Glass 3 | IPS LCD Capacitive Touchscreen, OGS |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 10.1 inches | 4.0 inches | 6.0 inches |
| Resolution | 1366 x 768 pixels (155 ppi) | 480 x 800 pixels (233 ppi) | 720 x 1280 pixels (245 ppi) |
| Screen-to-Body Ratio | 62.80% | 59.74% | 67.36% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | No | FM Radio | FM Radio with Recording |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 8 MP, 3264 x 2448 pixels | 5 MP, 2592 x 1944 pixels | 8 MP, 3264x2448 pixels |
| Flash | LED flash | No | LED flash |
| Features | Auto focus, Geo-tagging | Auto focus, Geo-tagging, Panorama | Auto focus, Geo-tagging, Touch Focus, Face Detection, 360 degree Panorama, HDR, Image Stabilization |
| Video | Yes, 1080p@30fps | Yes, 1080p@30fps | Yes, 1080p@30fps |
| Front Camera | Yes, 2 MP [Similar] | Yes, VGA [Similar] | Yes, 1.6 MP [Similar] |
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| GPRS | No | Yes | Yes |
| Edge | No | Yes | Yes |
| 3G | - | HSDPA, 42.2 Mbps; HSUPA, 5.76 Mbps | HSDPA, 42.2 Mbps, HSUPA, 11.5 Mbps |
| Bluetooth | Yes, v4.0 with A2DP | Yes, v4.0 with A2DP, EDR | Yes, v4.0 |
| Wi-Fi | Wi-Fi 802.11 b/g/n | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi hotspot |
| USB | Yes, USB v2.0, USB Host support | Yes, microUSB v2.0 | Yes, microUSB v2.0 |
| GPS | Yes | Yes, with A-GPS support | Yes, with A-GPS support |
| Browser | HTML5 | HTML | HTML5 |
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| Internal | 32/64 GB storage, 2 GB RAM | 8 GB, 1 GB RAM | 8 GB ROM, 1 GB RAM |
| Expandable Storage | microSD, up to 64 GB | microSD, up to 64 GB | microSD, up to 32 GB |
| USB OTG | 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 | Standard battery | Li-Po Battery | Li-Ion Battery |
| Capacity | 25 Wh | 1200/1600 mAh | 3000 mAh |
| Stand by | - | Up to 192 h | - |
| Talk Time | Up to 9 h | Up to 10 h | - |
