Here is a 2560x1440 taken on test shows quality; DOWNLOAD IT, not watch online: https://drive.google.com/file/d/0B5wG8SV5Dm_JZy10YlI4eXR3ejg/view?usp=sharing
You need micro sd card.Caution
Take care when buying an Action Camera, many with HD or UHD are fake specifications. Even some of the Eken models sensor is only 4Mp!!.
If in doubt, check the LCD sensor and if none are shown, likely the camera is a fake resolution.
I have purchased several models and only 2 were of sufficient resolution to be acceptable this model is one:
MGCOOL Explorer 1S 4K ultra HD action sport camera.
Sports a Novatek NT96660 chipset, with real 12MP 1/2.3 inch Sony IMX 078 CMOS sensor 4K / 24FPS video resolution, ultra high definition video shooting for a clear image 20MP still image resolution, variable 170 degree wide angle lens. 2 inch screen, WiFi connection, up to 10m WiFi distance. Support max 64G extended TF card ( not included )
Waterproof housing case, up to 30m water resistance
Removable 1050mAh rechargeable Li-ion battery, support about 80 minutes working time at 1080P
You can download the APP "Mgcool Explorer 1S" in Google Play or Apple Store
Video Resolution 4K(3840*2160)15fps, 2K(2560*1440)30fps, 1080P(1920 x 1080)60fps/30fps,720P(1280*720)120fps/60fps/30fps
Image Resolution 16M/14M/12M/10M/8M/5M
1:1xMGcool Explorer 1s with waterproof case 2:1xCamera Bracket 3:1xclip 4:1xUSB data cable 5:1xBicycle stand 6:2xHelmet base 7:1xAdaptor 8:1xUser manual 9:1xWarranty card