| Product |
Vivo Y81i
|
Xiaomi Redmi 4 (China)
|
| Battery |
| Charging |
- |
10W wired |
| Type |
3260 mAh, non-removable |
Li-Po 4100 mAh, non-removable |
| Body |
| Build |
Glass front (Gorilla Glass), plastic back, plastic frame |
- |
| Dimensions |
155.1 x 75 x 7.8 mm (6.11 x 2.95 x 0.31 in) |
141.3 x 69.6 x 8.9 mm (5.56 x 2.74 x 0.35 in) |
| SIM |
Nano-SIM + Nano-SIM |
Hybrid Dual SIM |
| Weight |
143 g (5.04 oz) |
156 g (5.50 oz) |
| Comms |
| Bluetooth |
5.0, A2DP, LE |
4.1, A2DP, LE |
| Infrared port |
- |
Yes |
| NFC |
No |
No |
| Positioning |
GPS, GLONASS, BDS |
GPS, GLONASS, BDS |
| Radio |
FM radio |
FM radio |
| USB |
microUSB 2.0, OTG |
microUSB 2.0 |
| WLAN |
Wi-Fi 802.11 b/g/n, Wi-Fi Direct |
Wi-Fi 802.11 a/b/g/n, dual-band, Wi-Fi Direct |
| Display |
| Protection |
Corning Gorilla Glass |
- |
| Resolution |
720 x 1520 pixels, 19:9 ratio (~270 ppi density) |
720 x 1280 pixels, 16:9 ratio (~296 ppi density) |
| Size |
6.22 inches, 96.6 cm2 (~83.0% screen-to-body ratio) |
5.0 inches, 68.0 cm2 (~69.1% screen-to-body ratio) |
| Type |
IPS LCD |
IPS LCD |
| Features |
| Sensors |
Accelerometer, proximity, compass |
Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass |
| Launch |
| Announced |
2018, October. Released 2018, November |
2016, November. Released 2016, November |
| Status |
Discontinued |
Discontinued |
| Main Camera |
| Features |
LED flash, HDR, panorama |
LED flash, HDR, panorama |
| Single |
13 MP, f/2.2, PDAF |
13 MP, f/2.2, PDAF |
| Video |
1080p@30fps |
1080p@30fps |
| Memory |
| Card slot |
microSDXC (dedicated slot) |
microSDXC (uses shared SIM slot) |
| Internal |
16GB 2GB RAM |
16GB 2GB RAM |
|
eMMC 5.1 |
eMMC 5.1 |
| Misc |
| Colors |
Black, Red |
Gold, Dark Gray, Silver |
| Models |
1812, 1812_19 |
- |
| Network |
| 2G bands |
GSM 850 / 900 / 1800 / 1900 |
GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G bands |
HSDPA 850 / 900 / 2100 |
HSDPA 850 / 900 / 1900 / 2100 |
| 4G bands |
1, 3, 5, 7, 8, 38, 40, 41 |
1, 3, 7, 38, 39, 40, 41 |
| Speed |
HSPA 21.1/5.76 Mbps, LTE (2CA) Cat7 300/150 Mbps |
HSPA, LTE |
| Technology |
GSM / HSPA / LTE |
GSM / CDMA / HSPA / EVDO / LTE |
|
- |
CDMA2000 1xEV-DO & TD-SCDMA |
| Platform |
| Chipset |
Mediatek MT6761 Helio A22 (12 nm) |
Qualcomm MSM8937 Snapdragon 430 (28 nm) |
| CPU |
Quad-core 2.0 GHz Cortex-A53 |
Octa-core 1.4 GHz Cortex-A53 |
| GPU |
PowerVR GE8320 |
Adreno 505 |
| OS |
Android 8.1 (Oreo), Funtouch 4 |
Android 6.0.1 (Marshmallow), MIUI 8 |
| Selfie camera |
| Single |
5 MP, f/2.2 |
5 MP, f/2.2 |
| Video |
|
1080p@30fps |
| Sound |
| 3.5mm jack |
Yes |
Yes |
| Loudspeaker |
Yes |
Yes |
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