Side by side comparison and review of LG K51S and LG K40. Compare sizes, cameras, batteries, memory capacities and other key specifications and features to simplify the choice of your perfect phone. Our goal is to make it easier for you to decide on the phone that will best meet your expectations by revealing the main differences between the products.
| DESIGN AND DIMENSIONS | LG K51S | LG K40 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | LM-K510EMW | LM-X420EMW | |
| Form Factor | Touch | Touch | |
| Height | 165.2 mm | 153 mm | LG K51S has greater height than LG K40. |
| Width | 76.7 mm | 71.9 mm | LG K51S has greater width than LG K40. |
| Depth | 8.26 mm | 8.3 mm | LG K51S is narrower than LG K51S. |
| Weight | 194 g | 145 g | LG K40 is lighter than LG K51S. |
| Body Colour | Pink | Titan | New Aurora Black | Moroccan blue | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | 1.335 W/kg (body), 0.501 W/kg (head) | 1.597 W/kg (body), 0.518 W/kg (head) | |
| Integrated Components | - | FM radio | |
| Connector Type | Headset jack - mini-phone 3.5mm USB Type-C - 24 pin USB-C |
Headset jack - mini-phone 3.5mm Micro-USB - 5 pin Micro-USB Type B |
|
| SIM Card Type (Size) | Nano SIM | - | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | LG K51S | LG K40 |
|---|
| Display Type | LCD display | LCD display | |
|---|---|---|---|
| Display Technology | IPS | IPS | |
| Screen Size (Display Size) | 6.55" | 5.7" | LG K51S has larger screen size than LG K40. |
| Screen Resolution (Display Resolution) | 1600 x 720 pixels | 1440 x 720 pixels | LG K51S has better screen resolution than LG K40. |
| Display Format | HD+ | HD | |
| Pixel Density | 268 ppi | 282 ppi | LG K40 has better pixel density than LG K51S. |
| Aspect Ratio | 20:9 | 18:9 | |
| Max Brightness | 400 cd/m² | - | |
| Display Features | Reading mode, FullVision display, night mode, hole in display | Curved glass, FullVision display | |
| Display Protection (Screen Protector) | Tempered glass | - |
| PROCESSOR | LG K51S | LG K40 |
|---|
| Processor Type (CPU) | MediaTek | MediaTek | |
|---|---|---|---|
| Processor Number | MT6765 | MT6762 | |
| Clock Speed | 2.3 GHz | 2 GHz | LG K51S has higher clock speed than LG K40. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| 64-bit Architecture | Yes | Yes | Both phones have 64-bit architecture. |
| Graphics System (GPU) | IMG PowerVR GE8320 | PowerVR GE8320 |
| MEMORY | LG K51S | LG K40 |
|---|
| RAM | 3 GB | 2 GB | LG K51S has more RAM than LG K40. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 64 GB | 32 GB | LG K51S has more internal memory than LG K40. |
| User Memory | 50.2 GB | 20.2 GB | |
| Supported Flash Memory Cards (Expandable Memory) | microSDHC, microSDXC - up to 2 TB | microSDHC, microSDXC - up to 2 TB |
| CAMERA | LG K51S | LG K40 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 1 | |
|---|---|---|---|
| Sensor Resolution | 32 Megapixel | 16 Megapixel | LG K51S has better camera resolution than LG K40. |
| Sensor Size | - | 1/3" | |
| Lens Aperture | F/1.8 | F/2.0 | LG K51S has better lens aperture than LG K51S. |
| Field of View (FoV) | 76.3 degree(s) | - | |
| Pixel Size | - | 1 μm | |
| Focus Adjustment | Automatic | Automatic | |
| Minimum Focal Length (Focal Distance) | 24 mm | - | |
| Digital Zoom | 8x | - | |
| Self-Timer Delay | Yes | - | |
| Special Effects | HDR | - | |
| Camera Modes | Burst mode, portrait mode, Flowers, Animals, Food, Person, Sunset, Sunrise, City, Landscape | - | |
| Face Recognition (Face ID) | Face detection | - | LG K51S has face detection. |
| White Balance | Automatic | - | |
| Light Source | LED flash | LED flash | |
| Video Resolutions | 1920 x 1080 (1080p) at 30 fps | - | |
| Camera Features (Functions) | Phase Detect Auto-Focus (PDAF), geotagging, Big Pixels technology, Quad Pixel technology | Phase Detect Auto-Focus (PDAF), GIF Creation, 8 different scenes |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 5 Megapixel | - | |
|---|---|---|---|
| Lens Type (2nd Camera) | Super wide-angle lens | - | |
| Lens Aperture (2nd Camera) | F/2.2 | - | |
| Field of View (2nd Camera) | 115 degree(s) | - | |
| Minimum Focal Length (2nd Camera) | 16 mm | - |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 2 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (3rd Camera) | F/2.4 | - | |
| Field of View (3rd Camera) | 88.9 degree(s) | - | |
| Camera Functions (3rd Camera) | Depth camera | - |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 2 Megapixel | - | |
|---|---|---|---|
| Lens Aperture (4th Camera) | F/2.4 | - | |
| Field of View (4th Camera) | 88.6 degree(s) | - | |
| Camera Functions (4th Camera) | Macro camera | - | |
| Camera Features (4th Camera) | 4cm macro photography | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 13 Megapixel | 8 Megapixel | LG K51S has better front camera resolution than LG K40. |
| Sensor Size (Front) | - | 1/4" | |
| Lens Aperture (Front) | - | F/2.0 | |
| Pixel Size (Front) | - | 1.12 μm | |
| Camera Modes (Front) | Gesture Shot, Selfie portrait | Portrait mode | |
| Face Recognition (Face ID) | Face detection | - | LG K51S has face detection. |
| Light Source (Front) | - | LED flash | |
| Camera Features (Front) | 17 filters | - |
| BATTERY AND CHARGING | LG K51S | LG K40 |
|---|
| Battery Capacity (Battery Size) | 4000 mAh | 3000 mAh | LG K51S has larger battery capacity than LG K40. |
|---|---|---|---|
| Standby Time | 100 hours | 100 hours | Both phones have the same standby time. |
| Talk Time | 480 minutes | 480 minutes | Both phones have the same battery life when making calls. |
| Run Time Details | Talk: up to 480 min Standby: up to 100 hrs |
Talk: up to 480 min Standby: up to 100 hrs |
|
| Battery Technology | Lithium Ion | Lithium Ion |
| CELLULAR | LG K51S | LG K40 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 4G | Both phones have the same mobile network generation. |
| Operating System | Android 9.0 Pie | Android 8.1 Oreo | |
| User Interface | LG UX 9 | - | |
| Intelligent Assistant | Google Assistant | Google Assistant | |
| Navigation | GPS | GPS |
| COMMUNICATIONS | LG K51S | LG K40 |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, FDD-LTE, TDD-LTE | GPRS, EDGE, HSDPA, HSUPA, HSPA+, FDD-LTE, TDD-LTE | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 4G LTE Band | Band 1, Band 3, Band 7, Band 8, Band 20, Band 38 | Band 1, Band 3, Band 7, Band 8, Band 20, Band 38 | |
| 4G LTE Frequency | FDD 2100, FDD 1800+, FDD 2600, FDD 900, FDD 800 DD, TDD 2600 | FDD 2100, FDD 1800+, FDD 2600, FDD 900, FDD 800 DD, TDD 2600 | |
| Wireless Interface | IEEE 802.11a/b/g/n | IEEE 802.11a/b/g/n/ac | |
| Bluetooth | Bluetooth 5.0 BLE | Bluetooth 5.0 LE | |
| Bluetooth Profiles | HFP, HSP, OPP, PAN, SPP, GOEP, A2DP, AVRCP, HID, SAP, GAVDP, PBAP, MAP, GATT, HDP, HOGP, ScPP | - | |
| NFC | Yes | Yes | Both phones have an NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | SMS, MMS |
| MEDIA | LG K51S | LG K40 |
|---|
| Supported Digital Audio Standards | WMA, AAC, PCM, MP3, FLAC, AAC +, eAAC+, OPUS, AMR-WB, AMR-NB, Vorbis | WMA, AAC, PCM, MP3, FLAC, AAC +, eAAC+, OPUS, AMR-WB, AMR-NB, Vorbis | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, FLV, AVI, WMV, ASF, 3GP, TS, WebM, OGM, MP4 | - | |
| Sound Enhancements | DTS: X 3D Surround Sound | DTS: X 3D Premium Sound |
| FEATURES | LG K51S | LG K40 |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | |
|---|---|---|---|
| Sensors | Accelerometer, ambient light sensor, proximity sensor, digital compass | Ambient light sensor, proximity sensor | |
| Security Devices | Fingerprint reader | Face recognition, fingerprint reader | |
| Additional Phone Features | DLNA Certified, Dual microphones, KnockON, QuickMemo+ function, Mini View function, Capture+, EasyHome, Clip Tray, Google Lens, AI Cam, Game Tools, Google Assistant Button | Google Lens, Google Assistant Key, AI Cam |
| OTHERS | LG K51S | LG K40 |
|---|
| Included Accessories | Power adapter, SIM card removal tool, USB-C cable | Power adapter | |
|---|---|---|---|
| Compliant Standards | MIL-STD 810G | MIL-STD 810G |
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