Casio Japan have today announced the release of the second generation of Bluetooth enabled G-Shocks which follow the release of the G-Shock GB-6900 bluetooth earlier this year. The new release consists of the GB-5600AA model which is based on the classic square DW-5600 along with the GB-6900AA which is identical to the previously released bluetooth GB-6900. The G-Shock GB-5600AA is available in four colorways and the G-Shock GB-6900AA available in five colorways. It's unclear from the release what differences these second generation models have over the initial GB-6900 release, however given the identical specification we can only assume there are software improvements, possibly some updated hardware and definitely more color choices 
The new bluetooth enabled G-Shocks' main features are
*Sync watch time to smartphone time
*Audio and vibrate alert on watch for on incoming SMS
*Audio and vibrate alert on watch for on incoming call
*2 year battery life (assuming connected 12 hours per day)
*Alert for dropped bluetooth link
The new models are compatible with the iPhone 4s along with various Japan only Android models. We would expect the new bluetooth G-Shocks to also be compatible with some newer Android handsets released worldwide.
The G-Shock GB-6900AA line is available from October 2012, the G-Shock GB-5600AA from November 2012. Japanese retail on both is ¥18900 which is approx USD$250 or GBP£160 - identical to the intial release price of the original G-Shock GB-6900.
The new bluetooth enabled G-Shocks' main features are
*Sync watch time to smartphone time
*Audio and vibrate alert on watch for on incoming SMS
*Audio and vibrate alert on watch for on incoming call
*2 year battery life (assuming connected 12 hours per day)
*Alert for dropped bluetooth link
The new models are compatible with the iPhone 4s along with various Japan only Android models. We would expect the new bluetooth G-Shocks to also be compatible with some newer Android handsets released worldwide.
The G-Shock GB-6900AA line is available from October 2012, the G-Shock GB-5600AA from November 2012. Japanese retail on both is ¥18900 which is approx USD$250 or GBP£160 - identical to the intial release price of the original G-Shock GB-6900.