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(Pocket-lint) - Casio has introduced two new composite models to its premium Frogman Master of G series line-up.

The composite band G-Shock GWF-A1000C and GWF-A1000XC are the Casio sub-brand's top of the range diving watches, with a chunky, substantial aesthetic and are diver-level, ISO certified water-resistant to 200-metres.

Like the A1000 on which they are based, they each come with the brand's proprietary "Tough Solar" charging system, which is capable of topping up the battery from any light source, artificial or natural.

Bluetooth connectivity is on board too, enabling each watch to hook up to a smartphone (iOS or Android) for personalisation and configuration. The dedicated G-Shock Connected app can also be used for detailed dive logs and location information. There is also stats on tides for over 3,000 diving areas around the world.

Automatic time updates and a phone finder are also built in.

The composite band on both watches can be extended to be worn over a wetsuit. Its mechanism can also be folded to comfortably fit a wrist when not diving.

The GWF-A1000C has a band made up of resin segments, while the bezel is stainless steel with a blue ion-plated finish. It retails for £899 in the UK.

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The GWF-A1000XC's band is made from carbon-reinforced resin and has a carbon bezel with a single orange layer to match the face. It retails for £1,149 in the UK.

Writing by Rik Henderson.