Oppo R7s

The OPPO R7s comes with a 3070mAh lithium battery that supports VOOC flash charging for 5 minutes and 2 hours of calls,[5] while Samsung Galaxy A7 only has 2600mAh battery in 2015.[6] In addition, compared to iPhones, iPhone 7s comes with 2900mAh, iPhone 8s comes with 2675 mAh and iPhone X comes with 2716mAh.[7] Unlike other companies, Apple never publish their battery capacity figures. Normally, they will release them later when tech enthusiasts get their hands on the devices.

Since OPPO launched Find7 in 2014, almost all of its main models have fully supported VOOC flash technology. OPPO R7s, as a major product of OPPO in the second half of 2015, can't miss the VOOC flash, because if let them recharge for 30 minutes. OPPO R7s can reach 75% electric quality with 20W while iPhone XR only has 50% with 18W adapter.[8][9]

The OPPO R7s camera is combined with a front 8 million pixels and a rear 13 million pixels, which supports phase focusing and global flash system.[5] In contrast to iPhone, all of them have a 7 million pixels because of the same basic specs for the front camera and 12 million pixels for the rear camera.[7] The OPPO R7s uses a ‘Flash Shot’ technology, as the camera only needs 0.1 seconds to focus, which allows the phone to take a shot very quickly, comparing to the iPhone 6s, which is also similar. The OPPO R7s have a good all rounder shot, however there are still some areas that the phone's camera can improve. Tests have shown that the camera's dynamic range is ‘noisy’ and the focus is not always fast, which iPhone 6s performs better as well as Lumia 950XL and Samsung Galaxy S6 series.[10] One of the flaws on OPPO R7s camera is that under low light conditions the speed of the shutter reduced significantly as very steady hands are needed to avoid blur image. Moving on to the front camera, its 8MP with f/2.4 aperture, as the camera is able to offer a reasonably wide angle for small groups. Comparing to iPhone, the front camera is 5MP to help and improve image quality, however, both rear and front cameras has HDR mode, filters, timer and flash.[11] The video system on OPPO R7s can be set to 720p, with realistic and cool colors, comparing to iPhone which can capture 4k video at 30 frames per second.

One of the most features is OPPO R7s magnesium-aluminum alloy unibody construction. Similar to the other two phones named OPPO R7 and OPPO R7 plus, the OPPO R7s have a unibody design with full metal which feels solid in hand. Similar to R7 Plus, it lacks capacities navigation keys which allows for a more comfortable managing experience.[12] Another best key features is for its design, especially dual-SIM dual-standby capability of OPPO R7s, which comes with a double edge: using the R7s either with a microSIM and a microSD or a microSIM and a nanoSIM.[14] If you are switching from a device reliant on the nanoSIM — like say an iPhone 5 or 6, or a Samsung Galaxy S6 — you have this format, and when you throw this in the tray, you are actually slotting it into the section that handles both the microSD and the nanoSIM. Compared to iPhone 6s, the height and width of it is 138.3 mm and 67.1 mm respectively, while OPPO R7s is bigger than iPhone 6s at 151.8 mm and 75.4 mm.[15] Also, display is also a feature for OPPO R7s. The resolution of it is 750x1334 pixels, while the resolution of OPPO R7s is 1080x1920 pixels which provides full HD.[15] And the pixel density of OPPO R7s is over 400 ppi, which is higher than iPhone 6s's at 326 ppi.[15] Furthermore, OPPO R7s has memory card of microSD and its memory ram is 4 GB, which is twice than that of iPhone 6s's.[15] Finally, OPPO R7s has great battery life compared with other phones, for example iPhone 6s, which has 1715 mAh.[14][15] OPPO R7s includes a feature called VOOC (Voltage Open Loop Multi-step Constant-Current Charging) this allows the phone to charge from 1% to 100% in just 35 minutes.[16]

Oppo has made a fair amount of mid-range models designed to take the fight to its premium competitors, but the Oppo R7s feels like a mid-ranger sitting in the middle of a bunch of other mid-rangers. There's the Oppo R7 with similar hardware and a smaller screen, the Oppo R7 Plus with similar hardware and a bigger screen, and then there's this phone — the R7s — which kind of sits in between both. However, OPPO R7s still has some things should be improved. The phones does not have a finger print system, which weakens the security system. Also contrast with iPhone 6s, OPPO R7s is lack of NFC (Near Field Communication) when iPhone 6s has Apply Pay and FM radio were a major disappointment of the smart phone.[15][17] Although the Oppo R7s can record high-resolution 1920 x 1080 movies, it is hard to find any evidence of the R7s featuring an HDMI port, which is convenient to watch HD videos on your shiny HDTV.[13] Furthermore, sealed battery, microSD slot shared with second SIM has a negative side.[14] The slot of the mobile phone card is a multi-function slot shared by SD card and SIM, the correct installation position of the Nano SIM card should be perpendicular to the position of Micro SIM, but the icon on the back of the phone is not obvious, and it is easy for the new users to install by mistakes. Lastly, the variants for OPPO R7s only has one type for customers which is 32 GB, however, compared to iPhone 6s, it has kinds of storages.[15] This gives customers more choices.