The camera has a megapixel sensor and upscaling up to 16 megapixels. There is nothing 21mp in it. Seriously, that's a less capable camera than the $30 camera at Walmart.
Enhanced TrustFire DF30 150Β° Diving Photography Video Flashlight β 2350 Lumens Underwater Camera Dive Light with Rechargeable 32650 Battery
10 Review
GoPro HERO8 Black Ultimate Bundle - HERO8 Black Camera, Shorty, Head Strap, 32GB SD Card, 2 Rechargeable Batteries
50 Review
Panasonic Lumix DMC-TS25 - Rugged 16.1 MP Digital Camera with 8x Intelligent Zoom (Black)
15 Review
π· Nikon W300 Waterproof Underwater Digital Camera with TFT LCD, 3-inch, Yellow (Model 26525)
9 Review