Asus J121 vs Xiaomi Redmi 4A
| Type | Clamshell | Touch |
| Dimensions | 80.00 x 40.00 x 20.50 mm | 139.90 x 70.40 x 8.50 mm |
| Weight | 80.00 g | 131.50 g |
| Display size | 1.80" | 5.00" |
| Display | Color / TFT 256k colors 128 x 160 px (1.80") | Color / IPS TFT 16M colors 720 x 1280 px (5.00") 294 ppi |
| Display protection |   | |
| Additional display | Color / CSTN 64k colors 96 x 64 px (1.00") | |
| Protection of the secondary display | | |
| Talk time (max.) | 2G: 300 min. (5.0 h) |  |
| Stand-by (max.) | 2G: 300 h. (12.5 days) | |
| Standard battery | Li-Ion 720 mAhBuy powerbank
| Li-Ion 3120 mAhBuy powerbank
|
| Quick battery charging | | |
| Wireless battery charging | | |
| Phonebook memory | 300 places | |
| Internal memory | 64 MB | 16 GB, 32 GB |
| RAM memory | | 2 GB |
| Memory cards | |  microSD, microSDHC, microSDXC up to 128 GBBuy memory card |
| Operating system | - | Android 6.0 Marshmallow |
| Interface | - | MIUI 8 |
| Processor | - | Qualcomm Snapdragon 425 8917 |
| Processor clock | - | 1400 MHz |
| GPU | - | Adreno 308 @500 MHz |
| Touchscreen | | |
| SAR (10g) | 1,15 W/kg | 1,181 W/kg |
| DualSIM | | |
| SIM cards standard | | DualSIM(microSIM, nanoSIM) |
| DualSIM mode | nd | dual standby |
| Hybrid DualSIM | nd | microSIM, microSD |
| Announced | 1Q 2005 | 4Q 2016 |
| Other names | - | - |
| GSM frequencies | 900 1800 1900 | 850 900 1800 1900 |
| UMTS | | 850 900 1900 2100 |
| LTE standard | | FDD LTE: 2600, 2100, 1800, 1700, 850, 800 TDD LTE: 2600, 2500, 2300, 1900 |
| CDMA | | |
| Standard TD-SCDMA | | 1900 2000 |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Photo sensor model | | Samsung S5K3L8 |
| Photo matrix | 0.3 Mpx | 13 Mpx |
| Resolution | 640x480 px | 4208x3120 px |
| Optical zoom | | |
| Flash | | LED |
| Dual-colour LED flash | | |
| Video resolution | | 1920x1080 px |
| Video formats | H.263, MPEG4, 3GP | |
| Additional | - | AF, f/2.2 |
CAMERAS - FRONT
| First camera | | |
| Photo matrix | nd | 5 Mpx |
| Resolution | nd | 2592x1944 px |
| Optical zoom | nd | |
| Flash | nd | |
| Dual-colour LED flash | nd | |
| Additional | nd | FF, f/2.2 |
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 |
| HSUPA | | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | | - |
| LTE UP | | 51.00 Mbit/s |
| WIMAX+ | | |
| GPRS | class 10 | |
| EDGE | | |
| Bluetooth | | v4.1 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | | v802.11 b/g/n |
| WiFi frequencies | | 2,4 GHz |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v1.1 | v2.0 |
| GPS | | |
| A-GPS | | |
| GLONASS | | |
| Beidou | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | | T9 |
| Swype | | |
| e-mail client | | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | | 3.5 mm |
| HD Voice | | |
| Sound formats | AAC | AAC, AAC+, AMR, FLAC, WAV, eAAC+ |
| Polyphony | 64 voices | |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | MIDP 1.0 | 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 | | |