The SJCAM Upgraded SJ4000 Action Camera is a versatile and affordable option for those looking to capture high-quality action footage without breaking the bank. With its dual-screen design, 4K30fps video resolution, and waterproof capabilities, this camera is packed with features that cater to both beginners and more experienced users.

One of the standout features of the SJ4000 is its dual-screen design. The front screen is particularly useful for selfies or ensuring the camera is properly positioned, while the rear 2-inch HD screen allows for easy previewing of videos and photos. This dual-screen functionality adds a layer of convenience that many users appreciate.

The camera's 4K30fps video resolution ensures that your footage is crisp and detailed. Users have reported that even at lower settings like 720p/30fps, the video quality remains impressive, making it suitable for a variety of activities such as driving, sports, and underwater adventures. The waterproof case allows for diving up to 30 meters, making it ideal for water sports enthusiasts.

Battery life is another strong point, with the package including two lithium-ion batteries and a charger. Some users have noted that using a higher-capacity battery can extend recording time significantly. However, there are some drawbacks to consider. The included SD card has been reported to overheat during use, prompting some users to purchase a higher-quality replacement.

While the camera offers wireless connectivity via WiFi for remote control through the SJCAM Zone app, some users have found the connection to be unreliable unless near a hotspot. Additionally, the lack of Bluetooth connectivity may be a dealbreaker for some.

In summary, the SJCAM Upgraded SJ4000 Action Camera offers excellent value for its price. It may not match the premium features of higher-end models like GoPro, but it delivers solid performance and versatility for most users. If you're looking for an affordable action camera with decent video quality and useful features like dual screens and waterproofing, this could be a great choice.