Xiaomi Redmi 4A vs Redmi Note 9
| Type | Touch | Touch |
| Dimensions | 139.90 x 70.40 x 8.50 mm | 162.30 x 77.20 x 8.90 mm |
| Weight | 131.50 g | 199.00 g |
| Display size | 5.00" | 6.53" |
| Display | Color / IPS TFT 16M colors 720 x 1280 px (5.00") 294 ppi | Color / IPS TFT 16M colors 1080 x 2340 px (6.53") 395 ppi |
| Display protection |   | Corning Gorilla Glass Buy screen protector
|
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) |  | 3G: 1980 min. (33.0 h) |
| Playback time (max.) | nd | Audio: 147 h (6.1 days) |
| Standard battery | Li-Ion 3120 mAhBuy powerbank
| Li-Ion 5020 mAhBuy powerbank
|
| Quick battery charging | |  |
| Wireless battery charging | | |
| Internal memory | 16 GB, 32 GB | 64 GB, 128 GB |
| RAM memory | 2 GB | 3 GB, 4 GB, 6 GB |
| Memory cards | microSD, microSDHC, microSDXC up to 128 GBBuy memory card | microSD, microSDHC, microSDXC |
| Operating system | Android 6.0 Marshmallow | Android 10 |
| Interface | MIUI 8 | MIUI 11 |
| Processor | Qualcomm Snapdragon 425 8917 | MediaTek Helio G85 MT6769V |
| Processor clock | 1400 MHz | 2000 MHz |
| GPU | Adreno 308 @500 MHz | ARM Mali-G52 MC2 @1 GHz |
| Touchscreen | | |
| SAR (10g) | 1,181 W/kg | |
| DualSIM | | |
| SIM cards standard | DualSIM(microSIM, nanoSIM) | DualSIM(nanoSIM, nanoSIM) |
| DualSIM mode | dual standby | dual standby |
| Hybrid DualSIM | microSIM, microSD | |
| Announced | 4Q 2016 | 2Q 2020 |
| Other names | - | Xiaomi Redmi Note 9 |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1900 2100 | 850 900 1700 1900 2100 |
| LTE standard | FDD LTE: 2600, 2100, 1800, 1700, 850, 800 TDD LTE: 2600, 2500, 2300, 1900 | FDD LTE: 2600, 2100, 1900, 1800, 1700, 900, 850, 800, 700 TDD LTE: 2600, 2500, 2300 |
| Standard 5G | | |
| CDMA | | |
| Standard TD-SCDMA | 1900 2000 | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | | Standard |
| Photo sensor model | Samsung S5K3L8 | |
| Photo matrix | 13 Mpx | 48 Mpx |
| Sensor size | | 1/2 |
| Pixel size | | 0,8 µm |
| Resolution | 4208x3120 px | |
| Optical zoom | | |
| Number of lenses | | 6 |
| Field of view | | 79 ° |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | 1920x1080 px | |
| Video formats | | H.263, H.264, MPEG4 - 30 fps |
| Additional | AF, f/2.2 | AF, f/1.79 |
| Second camera | | |
| Camera type | nd | Wide-angle |
| Photo matrix | nd | 8 Mpx |
| Sensor size | nd | 1/4 |
| Pixel size | nd | 1,2 µm |
| Optical zoom | nd | |
| Number of lenses | nd | 5 |
| Field of view | nd | 118 ° |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Video formats | nd | H.263, H.264, MPEG4 - 30 fps |
| Additional | nd | FF, f/2.2 |
| Third camera | | |
| Camera type | nd | Macro |
| Photo matrix | nd | 2 Mpx |
| Pixel size | nd | 1,75 µm |
| Optical zoom | nd | |
| Focal length | nd | 20 mm |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Video formats | nd | H.263, H.264, MPEG4 - 30 fps |
| Additional | nd | FF, f/2.4 |
| Fourth camera | | |
| Camera type | nd | Depth of field |
| Photo matrix | nd | 2 Mpx |
| Sensor size | nd | 1/5 |
| Pixel size | nd | 1,7 µm |
| Optical zoom | nd | |
| Number of lenses | nd | 3 |
| Flash | nd | LED |
| Dual-colour LED flash | nd | |
| Video formats | nd | H.263, H.264, MPEG4 - 30 fps |
| Additional | nd | FF, f/2.4 |
CAMERAS - FRONT
| First camera | | |
| Camera type | | Portrait |
| Photo matrix | 5 Mpx | 13 Mpx |
| Sensor size | | 1/3,06 |
| Pixel size | | 1,12 µm |
| Resolution | 2592x1944 px | |
| Optical zoom | | |
| Number of lenses | | 5 |
| Field of view | | 74 ° |
| Flash | | |
| Dual-colour LED flash | | |
| Video formats | | H.263, H.264, MPEG4 - 30 fps |
| Additional | FF, f/2.2 | FF, f/2.25 |
SENSORS
| Accelerometer | | |
| Proximity | | |
| Light | | |
| Magnetometer | | |
| Gyroscope | | |
| Barometer | | |
| Altimeter | | |
| Gravity | | |
| Hall-effect | | |
| Iris scanner | | |
| Fingerprint scanner | | |
| Thermometer | | |
| Hygrometer | | |
Data transfer
| xHTML | | |
| WAP | v2.0 | v2.0 |
| HSCSD | | |
| HSDPA | 42.20 Mbit/s | 42.20 Mbit/s |
| HSUPA | 5.76 Mbit/s | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | - | 301.50 Mbit/s |
| LTE UP | 51.00 Mbit/s | 150.80 Mbit/s |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | v4.1 | v5.0 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 b/g/n | v802.11 a/b/g/n/ac |
| WiFi frequencies | 2,4 GHz | 2,4 GHz; 5 GHz |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 | v2.0 Type-C |
| GPS | | |
| A-GPS | | |
| GLONASS | | |
| Beidou | | |
| Galileo | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | T9 | T9 |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | 3.5 mm | 3.5 mm |
| HD Voice | | |
| Sound formats | AAC, AAC+, AMR, FLAC, WAV, eAAC+ | AAC, AAC+, AMR, FLAC, MKA, WAV, eAAC+ |
| Polyphony | | |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | ART | ART |
| Videophone | | |
| DVB-H television | | |
| TV-Out | | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | | |
| Stopwatch | | |
| Alarm | | |
| Calculator | | |
| Currency converter | | |
| Organizer | | |
| Calendar | | |
| Flight mode | | |
| SyncML | | |
| Data and fax | | |
| Screensaver | | |
| Themes | | |
| Interchangeable covers | | |
| Voice dial | | |
| Speakerphone | | |
| Recorder | | |
| Vibrations | | |