Great deal, cheapest I could find :-
Overview
See how Action Cam opens spectacular new vistas with mesmerising 4K high quality and steady action. Capture your best moves in unforgettable 4K movies.
Totally new dimension in action movie shooting
Action Cam combines brilliant 4K imagination with Balanced Optical SteadyShot advanced camera-shake compensation. By controlling the entire optical path as one floating unit, Balanced Optical SteadyShot is significantly more effective at cutting the effects of camera shake. This advanced stabilisation system makes it easier to shoot beautifully clear, stable images while travelling, bike riding, and in other active situations.
Smart operation with friendly UI
Selecting and changing features has never been easier thanks to the new, intuitive user interface. All menus are easily accessible. Enjoy a seamless camera setting experience and find the perfect setting for your shooting needs. Camera can also be turned on/off via smartphone with PlayMemories Mobile.
BIONZ X™ for superior detail and texture
Sony's image processing engine faithfully reproduces textures and details, as seen by the naked eye, via extra high-speed processing. Together with front-end LSI (large scale integration) that accelerates processing, BIONZ X™ enables more natural details, more realistic images, richer tonal gradations and lower noise whether you're shooting photos or movies.
Exmor R™ CMOS sensor with enhanced sensitivity
Mountain-biking downhill at breakneck speed at dusk? Kayaking at dawn? Your footage is still going to look great, thanks to the low-light sensitivity with improved image clarity and drastically reduced grain provided by Sony’s Exmor R™ CMOS sensor.
Built-in stereo mic captures quality sound
Make a great movie even better with great audio. Built-in stereo microphone allows you to capture sounds of your adventure in two-track stereo, naturally. Clear sound with reduced noise enhances the most sophisticated movie work you can produce.
Sharp, ultra-wide ZEISS® Tessar™ lens
Capture epic wide-angle views with the ZEISS® Tessar lens or choose standard but striking views. Either way, you'll always be capturing beautiful shots of the most challenging ski slopes, mountain trails, swirling rapids or pitted asphalt paths.
Adjustable field of view and zoom freedom
Discover new flexibility to vary your shooting in action for dramatic effects and added excitement. For example, your angle of view can be selected from “Wide”, “Medium” or “Narrow”. In addition, seamlessly adjustable zoom mode enables you to change zooming while shooting.
4K Time-lapse Capture
Time-lapse Capture lets you produce time-lapse movies easily by using high-quality 4K still images shot at designated intervals. Then Action Cam Movie Creator (v. 5.1 for Windows, v.3.1 for Mac®) or Action Cam App (v. 2.0) simply transforms these images into an impressive time-lapse movie.
Underwater Housing as standard gear
Take Action Cam diving to 60 m/197 ft using supplied Underwater Housing —no need to buy optional gear. Equipped with a flat panel, it lets you control all camera buttons easily through the housing. What's more, it shields this hardy compact camera from shocks, damp, rust, dust and sand. Enjoy carefree aquatic adventures and extend your exploration to tough terrain.
Key Features
Exmor R™ CMOS sensor with enhanced sensitivity
Shoot in the dark with very subtle light, using this cutting-edge sensor.
BIONZ X™ image processor
Record fast moves and smooth action up to 4K at 100 Mbps.
ZEISS® Tessar™ lens
Capture landscapes with less distortion.
4K Ultra HD for four times the detail of Full HD
Reduced shake with Balanced Optical SteadyShot
New user interface provides intuitive camera operation
Shoot at desired angle with adjustable FOV and zooming
I believe they were $381 mid 2018 and you got a bonus $100 eftpos card as well. Supposed to be great cameras.