LG K51S vs Samsung Galaxy J4
| Type | Touch | Touch |
| Dimensions | 165.20 x 76.70 x 8.20 mm | 151.70 x 77.20 x 8.10 mm |
| Weight | 194.50 g | 175.00 g |
| Display size | 6.55" | 5.50" |
| Display | Color / IPS TFT 16M colors 60 Hz 720 x 1600 px (6.55") 268 ppi | Color / Super AMOLED 16M colors 720 x 1280 px (5.50") 267 ppi |
| Display protection |   | Corning Gorilla Glass Buy screen protector
|
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | 2G: 630 min. (10.5 h) 3G: 630 min. (10.5 h) 4G: 570 min. (9.5 h) |  |
| Stand-by (max.) | 2G: 370 h. (15.4 days) 3G: 370 h. (15.4 days) 4G: 370 h. (15.4 days) | |
| Standard battery | Li-Ion 4000 mAhBuy powerbank
| Li-Ion 3000 mAhBuy powerbank
|
| Quick battery charging | | |
| Wireless battery charging | | |
| Internal memory | 64 GB | 16 GB |
| End-user memory | 50.2 GB | |
| RAM memory | 3 GB | 2 GB |
| Memory cards |  microSD, microSDHC, microSDXC up to 2000 GBBuy memory card | microSD, microSDHC, microSDXC up to 256 GBBuy memory card |
| Operating system | Android 10 | Android 8.0 Oreo |
| Processor | MediaTek Helio P35 MT6765 | Samsung Exynos 7570 |
| Processor clock | 2300 MHz | 1400 MHz |
| GPU | PowerVR GE8320 @680 MHz | ARM Mali-T720 |
| Touchscreen | | |
| DualSIM | | |
| SIM cards standard | DualSIM(nanoSIM, nanoSIM) | SingleSIM(microSIM) |
| DualSIM mode | dual standby | nd |
| Hybrid DualSIM | | nd |
| Announced | 1Q 2020 | 2Q 2018 |
| Other names | LMK510EMW; LMK510HM; LMK510BMW; LMK510ZM; LMK510ZMW | SM-J400F |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1900 2100 | 900 1900 2100 |
| LTE standard | FDD LTE: 2600, 2100, 1800, 900, 800 TDD LTE: 2600 | |
| Standard 5G | | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | Standard | |
| Photo matrix | 32 Mpx | 13 Mpx |
| Optical zoom | | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | | 1920x1080 px |
| Video formats | H.263, H.264, MPEG4 - 30 fps | |
| Additional | AF | AF |
| Second camera | | |
| Camera type | Wide-angle | nd |
| Photo matrix | 5 Mpx | nd |
| Optical zoom | | nd |
| Field of view | 115 ° | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.263, H.264, MPEG4 - 30 fps | nd |
| Additional | FF | nd |
| Third camera | | |
| Camera type | Depth of field | nd |
| Photo matrix | 2 Mpx | nd |
| Optical zoom | | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.263, H.264, MPEG4 - 30 fps | nd |
| Additional | FF | nd |
| Fourth camera | | |
| Camera type | Macro | nd |
| Photo matrix | 2 Mpx | nd |
| Optical zoom | | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.263, H.264, MPEG4 - 30 fps | nd |
| Additional | FF | nd |
CAMERAS - FRONT
| First camera | | |
| Photo matrix | 13 Mpx | 5 Mpx |
| Optical zoom | | |
| Flash | | |
| Dual-colour LED flash | | |
| Video formats | H.263, H.264, MPEG4 - 30 fps | |
| Additional | FF | FF |
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 | 42.00 Mbit/s |
| HSUPA | 5.76 Mbit/s | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | - | |
| LTE UP | 51.00 Mbit/s | |
| WIMAX+ | | |
| GPRS | class 12 | |
| EDGE | class 12 | |
| Bluetooth | v5.0 | v4.2 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 b/g/n | v802.11 b/g/n |
| WiFi frequencies | 2,4 GHz | 2,4 GHz |
| WiFi Direct | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 Type-C | 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 | 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, MID, OGG, WAV, eAAC+ | AAC, AAC+, AMR, 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 | | |