| Product |
Xiaomi Mi 4
|
Vivo Y81
|
| Battery |
| Charging |
18W wired, QC2 |
- |
| Stand-by |
Up to 280 h (3G) |
- |
| Type |
Li-Ion 3080 mAh, non-removable |
3260 mAh, non-removable |
| Body |
| Build |
Glass front, plastic back, aluminum frame |
Glass front (Gorilla Glass), plastic back, plastic frame |
| Dimensions |
139.2 x 68.5 x 8.9 mm (5.48 x 2.70 x 0.35 in) |
155.1 x 75 x 7.8 mm (6.11 x 2.95 x 0.31 in) |
| SIM |
Micro-SIM |
Nano-SIM + Nano-SIM |
| Weight |
149 g (5.26 oz) |
146.5 g (5.15 oz) |
| Comms |
| Bluetooth |
4.0, A2DP |
5.0, A2DP, LE |
| Infrared port |
Yes |
- |
| NFC |
No |
No |
| Positioning |
GPS, GLONASS, BDS |
GPS, GLONASS, BDS |
| Radio |
FM radio |
No |
| USB |
microUSB 2.0, OTG |
microUSB 2.0 |
| WLAN |
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, hotspot |
Wi-Fi 802.11 b/g/n, Wi-Fi Direct |
| Display |
| Protection |
- |
Corning Gorilla Glass |
| Resolution |
1080 x 1920 pixels, 16:9 ratio (~441 ppi density) |
720 x 1520 pixels, 19:9 ratio (~270 ppi density) |
| Size |
5.0 inches, 68.9 cm2 (~72.3% screen-to-body ratio) |
6.22 inches, 96.6 cm2 (~83.0% screen-to-body ratio) |
| Type |
IPS LCD |
IPS LCD |
| Features |
| Sensors |
Accelerometer, gyro, proximity, compass, barometer |
Fingerprint (rear-mounted) - only 4 GB model; accelerometer, proximity, compass |
| Launch |
| Announced |
2014, July. Released 2014, August |
2018, June. Released 2018, June |
| Status |
Discontinued |
Discontinued |
| Main Camera |
| Features |
LED flash, panorama, HDR |
LED flash, HDR, panorama |
| Single |
|
13 MP, f/2.2, PDAF |
| Video |
4K@30fps, 1080p@30fps, 720p@120fps, HDR |
1080p@30fps |
| Memory |
| Card slot |
No |
microSDXC (dedicated slot) |
| Internal |
16GB 2GB RAM, 64GB 3GB RAM |
32GB 3GB RAM, 32GB 4GB RAM |
|
eMMC 5.0 |
eMMC 5.1 |
| Misc |
| Colors |
Black, White |
Black, Gold |
| Models |
2014215 |
1808, 1803, V1732A, 1808i |
| SAR |
|
- |
| Network |
| 2G bands |
GSM 850 / 900 / 1800 / 1900 - all versions |
GSM 850 / 900 / 1800 / 1900 |
| 3G bands |
TD-SCDMA - 4G model |
HSDPA 850 / 900 / 2100 |
| 4G bands |
38, 39, 40 - 4G model |
1, 3, 5, 7, 8, 34, 38, 39, 40, 41 |
| EDGE |
Yes |
- |
| GPRS |
Yes |
- |
| Speed |
HSPA, LTE, EV-DO Rev.A 3.1 Mbps |
HSPA, LTE |
| Technology |
GSM / CDMA / HSPA / EVDO / LTE |
GSM / CDMA / HSPA / LTE |
|
CDMA2000 1xEV-DO - Telecom 3G model |
CDMA 800 & TD-SCDMA |
| Our Tests |
| Audio quality |
Noise -91.6dB / Crosstalk -49.7dB |
- |
| Battery (old) |
Endurance rating 68h |
- |
| Camera |
Photo / Video |
- |
| Display |
Contrast ratio: 929 (nominal), 2.424 (sunlight) |
- |
| Loudspeaker |
Voice 62dB / Noise 62dB / Ring 66dB |
- |
| Platform |
| Chipset |
Qualcomm MSM8974AC Snapdragon 801 (28 nm) |
Mediatek MT6762 Helio P22 (12 nm) |
| CPU |
Quad-core 2.5 GHz Krait 400 |
Octa-core 2.0 GHz Cortex-A53 |
| GPU |
Adreno 330 |
PowerVR GE8320 |
| OS |
Android 4.4.3 (KitKat), upgradable to 6.0.1 (Marshmallow), MIUI 10 |
Android 8.1 (Oreo), Funtouch 4 |
| Selfie camera |
| Single |
8 MP, f/1.8 |
5 MP, f/2.2 |
| Video |
1080p@30fps |
|
| Sound |
| 3.5mm jack |
Yes |
Yes |
| Loudspeaker |
Yes |
Yes |
