SJCAM SJ4000 4K Action Camera — Waterproof, EIS, 20MP

The SJCAM SJ4000 is an entry-level 4K ultra-HD action camera with 20MP stills, built-in electronic image stabilization, WiFi, and an IP68-rated waterproof case for dives to 30 meters.

Compact and purpose-built for adventure, the SJ4000 packs a 170° wide-angle lens, 4K30 recording, 5× zoom, and dual 900mAh batteries into a simple-to-use package. It includes stabilization (EIS), a durable waterproof housing, and mounts that make it easy to attach to helmets, handlebars, or chests. The camera supports up to 128GB microSD storage and basic creative modes like time-lapse, loop recording, burst shooting, and motion-detect.

How clear are videos and photos recorded with the SJ4000?

The SJ4000 captures video up to 4K at 30fps and still images up to 20–40MP (model-dependent), giving sharp footage for casual and travel use. EIS helps reduce shake for smoother clips, while the 6-element fisheye lens and 170° field of view deliver a broad, immersive perspective.

• 4K/2K/1080p/720p selectable frame rates for flexible file sizes
• 20MP–40MP photo modes, plus burst and interval shooting
• Built-in EIS gyro stabilization for steadier handheld and action footage
• 170° super wide-angle lens to capture more scene in each frame

Can I use the SJ4000 for underwater activities and wet conditions?

Yes — the SJ4000 ships with a protective housing rated to IP68 that allows operation to 30 meters (98 ft) depth. Underwater mode adjusts color and exposure for clearer recordings when diving, snorkeling, or surfing while keeping the camera controls accessible inside the case.

• Included waterproof case for dives down to 30 meters
• Underwater mode optimizes image settings for aquatic scenes
• Sealed ports and durable housing protect against dust and moisture
• Mounts fit surfboards, chest harnesses, and helmet mounts for POV shots

What accessories and power options come with the camera?

The SJ4000 bundle typically includes two 900mAh rechargeable batteries plus a selection of mounts and a USB cable so you can shoot longer sessions and swap power on the go. The camera supports microSD cards up to 128GB for extended recording and can act as a dash cam or webcam with compatible setups.

• Two 900mAh batteries for extended runtime and hot-swap convenience
• Accessory kit: mounts, adhesive bases, clips, and a USB charging cable
• External mic support for improved audio when using compatible adapters
• Storage support up to 128GB (format card before first use)

How do I connect the SJ4000 to my phone and what shooting modes are available?

WiFi lets the SJ4000 pair with SJCAM-compatible apps for remote preview, settings, and file transfer; if connection fails, disabling phone cellular data often resolves interference. The camera offers loop recording, time-lapse, motion detection, interval photo, burst mode, and color presets so you can tailor footage to the activity.

• WiFi connectivity for remote control, preview, and downloads
• Loop recording and dash-cam capability for continuous capture
• Time-lapse, interval, motion detection, and burst shooting modes
• Five photo color presets to tweak contrast and saturation quickly

Who this camera is for: Adventurers and beginners who want a rugged, budget-friendly action camera that covers most outdoor needs — from hiking and cycling to snorkeling and skiing. It’s ideal for travelers who value compact gear with reliable stabilization, interchangeable mounts, and waterproof capability, as well as vloggers who need external mic support and WiFi transfer for quick sharing. If you want a straightforward, affordable way to record POV footage and underwater moments without a steep learning curve, the SJCAM SJ4000 is built for that purpose.