Product
Vivo Z1
Vivo Z1
Xiaomi Redmi Y1 (Note 5A)
Xiaomi Redmi Y1 (Note 5A)
Battery
Music play - Up to 75 h
Stand-by - Up to 240 h (3G)
Talk time - Up to 32 h (3G)
Type Li-Ion 3260 mAh, non-removable Li-Ion 3080 mAh, non-removable
Body
Build Glass front, plastic back, plastic frame Glass front (Gorilla Glass 3), plastic back, aluminum frame
Dimensions 154.8 x 75 x 7.9 mm (6.09 x 2.95 x 0.31 in) 153 x 76.2 x 7.7 mm (6.02 x 3.00 x 0.30 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 149.3 g (5.26 oz) 153 g (5.40 oz)
Comms
Bluetooth 5.0, A2DP, LE 4.2, A2DP, LE
Infrared port - Yes
NFC No No
Positioning GPS, BDS GPS, GLONASS, BDS
Radio FM radio FM radio
USB microUSB 2.0, OTG microUSB 2.0
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Display
Protection - Corning Gorilla Glass 3
Resolution 1080 x 2280 pixels, 19:9 ratio (~403 ppi density) 720 x 1280 pixels, 16:9 ratio (~267 ppi density)
Size 6.26 inches, 97.8 cm2 (~84.2% screen-to-body ratio) 5.5 inches, 83.4 cm2 (~71.5% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Fingerprint (rear-mounted), accelerometer, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Launch
Announced 2018, May. Released 2018, June 2017, November. Released 2017, November
Status Discontinued Discontinued
Main Camera
Dual 13 MP, PDAF 2 MP, (depth) -
Features LED flash, HDR, panorama LED flash, HDR, panorama
Single - 13 MP, f/2.2, 1/3.1", 1.12µm, PDAF
Video 4K@30fps, 1080p@30fps 1080p@30fps
Memory
Card slot microSDXC (uses shared SIM slot) microSDXC (dedicated slot)
Internal 64GB 4GB RAM, 64GB 6GB RAM, 128GB 6GB RAM 32GB 3GB RAM, 64GB 4GB RAM
  eMMC 5.1 eMMC 5.1
Misc
Colors Sapphire blue, Enamel blue, Hyun red, Enamel black, Black gold limited edition, Aurora Special Edition Gold, Dark Grey, Silver, Rose Gold
Models V1801A0 MDI6S, Redmi Y1, Redmi Note 5A
SAR - 1.09 W/kg (head)     1.44 W/kg (body)    
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, 8, 34, 38, 39, 40, 41 1, 3, 4, 5, 7, 8, 20, 38, 40
Speed HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps HSPA, LTE
Technology GSM / CDMA / HSPA / LTE GSM / HSPA / LTE
  CDMA 800 & TD-SCDMA -
Our Tests
Audio quality - Noise -92.1dB / Crosstalk -89.7dB
Battery (old) - Endurance rating 74h
Camera - Photo / Video
Display - Contrast ratio: 1673:1 (nominal), 2.556 (sunlight)
Loudspeaker - Voice 68dB / Noise 72dB / Ring 86dB
Performance - GeekBench: 2610 (v4.4) GFXBench: 5.6fps (ES 3.1 onscreen)
Platform
Chipset Qualcomm SDM660 Snapdragon 660 (14 nm) Qualcomm MSM8940 Snapdragon 435 (28 nm)
CPU Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) Octa-core 1.4 GHz Cortex-A53
GPU Adreno 512 Adreno 505
OS Android 8.1 (Oreo), Funtouch 4 Android 7.1.2 (Nougat), MIUI 11
Selfie camera
Single 12 MP, f/2.0, (wide), 1/2.8", 1.28µm 16 MP, f/2.5, (wide), 1/3.06" 1.0µm
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes