| Hardware and OS | Kestrel KM 451 | vivo Y11 |
| Operating system | Android v4.4 (Kitkat) | Android 4.4.4 (KitKat) |
| Processor | Dual core, 1 GHz | Quad-core 1.3 GHz Cortex-A7 |
| Chipset | MediaTek MT6572 | Mediatek MT6582М |
| GPU | | Mali-400MP2 |
| Internal memory | 4 GB | 4 GB, 512 MB RAM |
| External memory | Yes, Up to 32 GB | microSD, up to 256 GB (dedicated slot) |
| RAM | 512 MB | |
| Display | Kestrel KM 451 | vivo Y11 |
| Type | LCD | IPS LCD |
| Size | 4.5 inches (11.43 cm) | 4" inc |
| Resolution | | 480 x 800 px |
| PPI /points per inch/ | 218 ppi | |
| Touchscreen | Yes, Capacitive Touchscreen, Multi-touch | capacitive touchscreen |
| Screen-to-Body Ratio | | 59.2% |
| Display area | | 45.5 cm2 |
| Display aspect ratio | | 5:3 (height:width) |
| Pixel Density | | 233 PPI |
| Colors | | 16M |
| Connectivity | Kestrel KM 451 | vivo Y11 |
| 3G Bands | UMTS 2100 MHz | |
| Network Support | 3G, 2G | |
| SIM Slot(s) | Dual SIM, GSM GSM | |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| USB Connectivity | microUSB 2.0 | |
| Wi-Fi | Yes, Wi-Fi 802.11, b/g/n | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| Network | | GSM / HSPA |
| SIM card | | Dual SIM (Micro-SIM, dual stand-by) |
| Bluetooth | Yes | 4.0, A2DP, EDR |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | Yes | Yes, with A-GPS |
| Speed | | HSPA 21.1/7.2 Mbps |
| USB | | microUSB 2.0, USB Host |
| Camera | Kestrel KM 451 | vivo Y11 |
| Camera Setup | Single | |
| Camera Features | Digital Zoom | |
| Flash | Yes, LED Flash | |
| Image Resolution | 2592 x 1944 Pixels | |
| Main camera | 5 MP, Primary Camera, | 5 MP, Single |
| Specs | | 5 MP, AF |
| Features | | LED flash |
| Video | | 1080p@30fps |
| Selfie camera | 0.3 MP, Primary Camera, | 2 MP, Single |
| Multimedia | Kestrel KM 451 | vivo Y11 |
| Headphone jack | 3.5 mm | |
| FM Radio | Yes | |
| Loudspeaker | Yes | |
| 3.5 mm Jack | | Yes |
| Radio | | FM radio |
| Design | Kestrel KM 451 | vivo Y11 |
| Colours | Black, White | |
| Width | 66 mm | |
| Height | 138.3 mm | |
| Thickness | 9.3 mm | |
| Colors | | White, Black |
| Dimensions | | 123 x 62.5 x 8.8 mm |
| Weight | 150 grams | 124 g |
| Other features | Kestrel KM 451 | vivo Y11 |
| Other Sensors | Accelerometer | |
| Battery | Kestrel KM 451 | vivo Y11 |
| Capacity | 1750 mAh | |
| Type | Li-ion | |
| Battery capacity | | 1700 mAh, Removable Li-Po |
| Battery life | | Talking time- Up to 11 h (2G) / Up to 8 h (3G)
Music play - Up to 34 h |
| Other | Kestrel KM 451 | vivo Y11 |
| Release date | | 2014, Q4 |
| Sensors | | Accelerometer, proximity , Infrared port |
