WOLFBOX G840S 12" 4K Mirror Dash Cam Backup Camera with 32GB Card and GPS

Why it's worth it

The WOLFBOX G840S replaces your rearview mirror with a 12-inch display, recording 4K in front and 1080p behind. If you want a dash cam and a backup camera in one device, this is the most popular way to get both.

This is two products in one, and that's the whole argument for it. The G840S clamps over your existing rearview mirror and gives you a 12-inch screen with about 1.5 times the viewing area of a standard mirror. The front camera records in 4K, the rear in 1080p, and both run continuously with loop recording. When you shift into reverse, the rear feed takes over. For anyone who wants crash footage and a backing view without cluttering the windshield with two gadgets, it's a clean answer.

The rear lens covers 140 degrees and the front covers 170. WDR and HDR processing help with the classic problem of pulling out of a dark garage into bright sun, and owners report the night image is a real step up from a plain mirror. The screen uses a low-reflectivity LCD, which cuts the daytime glare that makes cheaper mirror cams unreadable at noon.

From our review of 7 backup cameras for car safety, by Ben Carter, Tech Editor

What we like

• +This is two products in one, and that's the whole argument for it
• +The rear lens covers 140 degrees and the front covers 170
• +It also does things a backup camera can't
• +This is the most widely bought product in this guide by a wide margin, and the volume of owner feedback makes its behavior…

What to know

• –Reliability is the recurring theme
• –The rear camera cable is short for some vehicles
• –A 12-inch mirror is a lot of mirror